Ron Amundson on February 17th, 2013

Every F2F (Face to Face) music teacher I’ve studied under, or chatted with has mirrored something like the following: Learn by doing seems a reasonable approach to music, but its also dangerous as it can open the door to bad technique which a student wont necessarily know until they hit a brick wall. When students hit said wall, they either plateau at that stage, or have to go back and unlearn things, often with significant difficulty. In addition, learn by doing also runs the risk of ineffective practice habits. Six hours of daily unfocused practice is no where near as helpful as 30 minutes of highly focused activity on the right stuff.

With F2F, student contact is usually limited to scheduled lesson frequency which is for the most part driven by student finances, but also instructor workload. With a weekly contact interval, some students will completely forget what was worked on, or even assigned the prior week… Yep, life happens sometimes, but in other cases, its just that playing / practicing the some cool material one learned a year ago is more fun than achieving proficient with 5-10 new jazz chords.

OE (Online Education) presents an opportunity to address the above factor by using a bi-weekly, or even daily coaching model. In addition, if done with a fair bit of automation, a coaching model could present significant value to the student, with a low workload on the part of the instructor (after one has developed their coaching methodology of course). The upfront workload to develop a online music coaching system will likely be pretty intense… but once developed, the scaling potentials are huge.

As far as how such might play out, consider the following scenario.

  • Student has been assigned piece ABC for the following week.
  • You know that various sections of the piece tend to be trouble areas, and have a tips / tricks sheet already to go.
  • On Day 2, the student gets a communication as to how its going, specifically referring to the trouble areas and/or practice habits.
  • If the student indicates no problems, offer some words of wisdom / encouragement, and perhaps a few more difficult exercises to practice.. If the student indicates problems, send off tips and tricks for the particular section of difficulty, and or practicing tips and tricks.
  • On day 4, check in with student, see if they have run into any other difficulty. If no problem, words of encouragement as above.
  • If difficulty, on day 5, review tips/hints trick with student (the only significant workload) and try to diagnose. if the student expresses no problems, discuss the additional exercises from a couple days ago if applicable.
  • On day seven, F2F lesson is scheduled, you already have an inkling of students trouble areas, student has already tried to address them, and you have a semblance of a diagnostic framework ready to go… This is a lot better than trying to fit diagnosing, dialoging, and offering suggestions for improvement all in the span of a 30 minute lesson. In addition, if life happens during the week, the next lesson can be adjusted to compensate for such, thus avoiding frustration on the part of the student. (Sometimes, its a good idea, just to run over ‘fun” stuff mixed with a tad of instruction in order to bolster motivation etc).

The value the student gets when online coaching is added to F2F lessons has a ton of potential… and for a lot of students will be worth quite a bit more than the nominal fee increases needed to cover the instructors time. In addition, once the instructor has built up their curricula / coaching plan, such a method scales in a huge way unlike 1:1 lessons. Lastly, the dramatic increase in the rate of a students achievements under such a model is likely to serve as a recruiting tool for to reach other students.

Granted, such an approach is not for everyone. Students needs and desires need to be at the forefront and online coaching may not be part of where they want to go… but as an option for others, it could be huge.

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Ron Amundson on April 26th, 2011

I wrote this about 5 years ago, and just came across it a couple days back. I’ve got another mic preamp circuit I’m playing with, and figured I best go back through my old notes to avoid wheel re-invention.

Why is it that the only decent preamps were made back in the 70′s…

I’ve been fighting this for almost 2 years. Hundreds of hours of messing around trying to get the right mic preamp. When I started this project, I mistakenly thought, how hard can it be. After all, its just audio. And at this point, maybe thats the issue, its just audio!

I’ve designed thousands of boards over the last 30 years, first as a hobbyist, than as a U student, and then as an engineer. Some boards were super high gain, and super low frequency, and others were GHz boards. Audio should be a calkwalk, and its not.

The biggest issue turns out to be phase shift. Noise is solvable, as is gain, and THD. One can deal with dynamic range pretty easily if the other 3 factors are handled appropriately. Where I end up getting bitten is the transfer function of phase shift, THD, and dynamic range as a function of frequency. It seems none of the commercial mic amps want to spec this… and with two good reasons. First, for those who understand it, they would be scared off. Secondly, most people don’t understand the phenomena. The problem is that whether a person understands it, or just reads it in a spec sheet, it makes little difference…. the issue is folks can HEAR it.

More on this rant later, gotta go eat

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updated 2/27/06

Part of the deal is the cost of labor. In the 70′s common practice was to test select parts. This usually meant matching transistors and even transformers and in a few cases, not by test gear, but by sound during the final test stages. Today, most assembly houses would have a bird if you asked them to test select, and would no bid it if such required a listening test. The 70′s often required a craftsman at the test bench, and today with its penny pinching models, most of the test techs are not at that level. They want speed and throughput, and any drive and patience they once has been driven away by bean counters. The mic preamp of the 70′s is not a commodity like today.

In addition, one would like to think that non-discrete solutions such as the TI INA163 upgrade to the SSM2017 would be an even better solution that the TL074 of years past. In fact, the SSM2017 is still often designed in, even though the INA163 has better specs. There is a lot that goes on in chasing ones tail in audio. A proven pcb layout is hard to beat, and to rip up/redo a SSM2017 layout may well equate to multiple spins to get equivalent performance in the INA163, and even more spins to get the mfgrs speced performance out of it. Remember, we’re not just chasing audio performance, but in commercial gear, we also need to meet EMC standards, which often times make for really messy compromises between the audio and RF domains.

One other thing that comes to mind is servo control of the ground, and DC coupling the audio to minimize phase error. Walt Jung had a number of papers on this in the early 90′s. On the outset, this seems a better solution than transformer coupling and its high cost and space requirements. On the other hand, a properly engineered C-Core transformer is near impossible to out perform spec wise… so it all comes down to economics, and one can buy a whole ton of op amps and discretes rather than a $12 C-Core at 10K/yr. Perhaps the saddest part of this, is economics often dictates letting the phase transfer functions slide all over the place. For most apps, if the other parameters are likewise under control, if the phase varies, its not all that big of a deal… but then again this is the 2006 not the 1970′s.

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Ron Amundson on March 24th, 2011

ImageI’ve been thinking a bit about the common pushbutton switch such as the Carling 110/316 series. They’ve been the standard effects pedal switch for years, albeit some outfits use cheaper knockoffs, likely to their peril. The nice thing about such switches is the great feedback they provide, even if one has a really thick boot on. Another great feature is their non-teasable nature, ie the contacts operate on an overcenter mechanism, so chattering on opening or closing is near impossible. Likewise, they are self cleaning via contact wiping.

However, if someone flings a beer, or worse, someone puts a beer on an amp, (where it is guaranteed to tip over) and you get beer in the switch, the party is likely over.

Image

This problem is somewhat mitigated by using a hinged cover plate over the switch such as in some Maestro pedals of years ago. Then again, hinged cover plates, whether custom extrusions as in the Moog, or plastic as in the FCB1010 serve to add extra cost. In addition, while deflecting most of the beer, ingress is still possible.

Capacitive sensing works wonders as far as providing a beer proof switch. Likewise, inductive, or even magnetic sensing can do well in the volume/wah pedal arena as far as beer proofing.

A big problem with capacitive sensing is providing feedback to the user. A LED status light while helpful is no where near as good as the massive tactile response one gets from a Carling 110/316. A possible solution to provide feedback in addition to an LED is a shaker solenoid, such that at actuation, the musicians foot would receive tactile confirmation.

Another problem is the issue of teasing, where in the over center action of a Carling 110/316 reigns, and capacitive sensing crashes and burns. Ie unlike most other apps, one cant use a long debounce time in a music application or you will aggravate the musician to no end. Adaptive tuning of the capacitive switch may or may not be an answer to this issue.

Lastly, there is the issue of musician preloading. Ie, its common practice for a musician to rest their foot on their pedal just prior to actuation. Again, adaptive tuning of the capacitive sensor may be an answer, although at this time, a mostly mechanical approach in addition to tuning on the fly seems more reasonable.

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Ron Amundson on March 13th, 2011

I came across the following from tymkrs where they discussed harmonica microphones. There seemed to be some somewhat contradictory info on google, so I asked them for some clarification. In a matter of 20 minutes, they sent me a link on the internals which filled in a lot of the back story.

A little bit of further digging, and I found out a bit about the fabrication of rochelle salts. Its a fairly old school albiet simple method of crystal growing… and it got me thinking a bit more. Ie, how are the lead wires attached, and how is the rochelle salt protected from damage.

A little bit on google patent search provided the Astatic Corps patent. Like many things of that era, labor was inexpensive, so the emphasis was more so on consistency than labor saving. In addition, the variety of materials to use in manufacturing was pretty limited.

Ultimately, this little bit of digging tonight opened up a huge number of ideas, not only in the microphone domain, but also for percussive sensing including instrument keys.

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Ron Amundson on February 23rd, 2011

One of the things I find both fascinating, but also troublesome about Youtube covers is the licensing aspect. Ie, a mechanical license, ie Harry Fox doesn’t really work, as you arent selling, and its not like you can go out and buy 1000 count license for 1000 browser hits. In addition, if you tweak the arrangement, a mechanical license alone is not enough, you need publishers permission. Furthermore, being video is involved, you really should have a sync license… and then figure on selling a good chunk of equity in your house to pull that off.

In other words… the optimum solution is to contact the copyright owner(s) and get permission, and work out a deal. Of course… more than likely, if you are able to track them down, you will likely find someone even more confused than you are. Even if they think such would be cool, more than likely no one will have much of a clue as to how to proceed without some attorney. In a lot of cases, it would seem a no might be a better answer.

That being said, there are covers of nearly everything on Youtube, and it doesn’t seem that very many get pulled, so what gives…

I came across the following post entitled Music, Copyright, and Youtube from @slainson and while she acknowledges the above grey, it seems there is a much much larger window than the above gloom and doom would suggest. Whats incredible cool, is that she keeps updated the entry as more info becomes know.

The following explanation seems very apt.

I think Youtube has developed a new licensing mechanism. It has created a database of content, then matches the content to the user, and lets the rights holder decide if the video needs to be taken down, if the sound gets shut off, or if the video stays. And as Youtube gets bigger, makes more money, and finds more ways to make it financially worthwhile to rights holders to be flexible about content usage, it creates a viable experiment to see if and how copyright and user creativity can work together. While pro-copyright and anti-copyright groups are debating, YouTube has actually created a system, though flawed, which is working and pushing the envelope without going so far as to get shut down..

The article is long, but if you are going to upload Youtube covers, it is a must read. To start building a fan base on Youtube, only to hit 3 strikes and get blown off the map is not cool at all. Some prework may well save a ton of aggravation…. plus you might connect with some really cool folks along the way.

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Ron Amundson on February 21st, 2011

Tdawn shared the following AES paper titled “Stop Counting Samples” on twitter, and it confirmed a whole multitude of things I’ve run into over the past few years. In a nutshell, digital audio is a vastly different animal than analog, especially post mastering, and if such is not considered, it will come back to bite, often in a huge way. Whats perhaps most distressing is that multitudes of young engineers grew up on digital, and yet it seems, and is shown in the analysis of recordings in table 2, they are blowing it.

Historical Hot Recordings

Back in my day, if you cranked up the levels too high, waveforms would get their peaks clipped and as a result, multiple harmonics of said waveform would result. In addition, the B-H curve / saturation characteristics of mag tape can make for some really interesting types of distortion, (and it approached with moderation, might even be considered pleasing to some folks ears).

Digital Music is often Subject to Post Production Processing

Digital post production processing is very common. On the one hand, it could be tricks used within a mp3 player to save silicon die space, on the other it could be tweaks used to optimize streaming audio, or even OTA broadcasting. Post production processing assumes that the input signal is good to go… When the input signal has digital artifacts, even if normally not audible, when you post process such, they can come back in spades. Fig 7 shows how this may occur in a huge way.

Image

Note the 5.5Khz tone… and the big spikes in spectral content mirrored above AND below 5.5Khz.

When it such shows up, outside of a sine wave in the lab, is that something may have sounded perfect in the mastering room, and even on a few different pieces of equipment… but a slightly different CODEC / re-sampling methodology in the customers home, and boom, all bets may be off.

Whose problem is it, artist or listener?

Granted, there likely are some folks who take the stance of, hey its good to go here, and if a customer plays it back on something else and the quality takes a dive, its their problem. I can sort of understand such… but then if a customer buys music, and has a bad experience, are they likely to blame the musician, or blame the signal processing going on in their device. More than likely, the musician is going to be the one taking the heat…

What about live recording?

Now, consider a recording of a live performance, where the musicians are using DSP amplifiers on stage for psycho acoustical effect. Micing such amps and then bringing them into the desk in addition to a direct feed for effect would seem to be all analog… but is it really? What about leakage into the vocal or crowd mics? Can such bite? Perhaps… the key is being careful throughout the entire signal path, and testing. Assumptions more often than not in the analog world worked out fine, and in many cases were a positive. The digital world is different, and if left unchecked, it can bite with a vengeance.

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Ron Amundson on February 11th, 2011

EMC made some interesting gear during the 70′s… and had something truly amazing, a lifetime guarantee! Of course being they went out of business prior to 1983 the lifetime part ended up being pretty short.

The S300 Guitar Amp had the following specs:Image

  • 125 Watts RMS
  • 5 band EQ
  • Reverb
  • Portable.. yep, it only weighed 90lbs!

 

EMC was located at

21819 Royalton RdImage

Cleveland, OK

Per google maps, the current building at that address is huge. Either they were really that big, or they just rented a portion of said building.

 

 

Beyond the S300, they also had a G200 and a line of PA systems.

In my first band, we had a EMC Gemini PA system, it was a 6 channel unit, and it had to 2 columns with 4 eight inch speakers in each one. It sounded ok, but when we paired it up with some homemade clones of a Peavey SP3, it could really rock.

Image

 

 

 

Granted, such a unit was of no comparison to the next group I was in where we had 4000Watts triamped, and 4 speaker columns reaching nearly 15 feet high… yet, for the average bar or small club, the Gemini did a super great job.

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Ron Amundson on February 8th, 2011

Many years ago, I had the opportunity to buy a Kustom Tuck and Roll Bass amp for a song, but being shy on cash, passed it up. On the other hand, it was the standard model, but had it been the red glitter one, I would have jumped a ton of hoops to make it happen… yep, I always thought it was super cool. Image

Its an interesting thing to consider tuck and roll as a covering in contrasted with tolex (textured vinyl), or todays textured polyurethanes (rhinolining and related coatings). Beyond its unique visual appearance, tuck and roll has some technical advantages. If one is hauling an amp in ones car, the sliding nature of tuck and roll on automotive upholstery makes life significantly easier. Having moved a ton of amps over the years, a buddys 2×12 tuck and roll cab is a lot easier to load into a sedans back seat, than a 2×12 tolex cab. Secondly, the real tuck and roll is incredibly robust, and easy to clean up too (granted, it does look really bad when folks leave a lighted smoke on top of it, or if pyro gets out of hand). Thirdly, it can also serve as a dampening material to reduce cabinet resonances… albeit testing would need to be done to see how much internal dampening material could really be removed.

However, like many things today, labor rates pretty much make real tuck and roll obsolete, except for purposes of restoration, or boutique amplifiers or cabinets. Yes, tolex is more labor intensive than spray on coatings, but its light years easier than traditional tuck and roll. That being said, there are some compromises that could be looked at.

DIY or possible Boutique Revival of Tuck and Roll

The lowest cost approach is what is called pleated vinyl to simulate tuck and roll. Depending upon the vinyls formulation, and heat sealing process, it might be on, but it will have a shorter life span than traditional tuck and roll. Many upholstery stores can provide such at around $25/yard. Its also available online at Garys Upholstery However, colors are pretty limited, and its lifespan is an unknown.

The next step up is channel quilting through the foam to simulate tuck and roll. Such is a lot less labor intensive than real tuck and roll… but there is a lot of tension on the single row of stitches, and for an amp or can which doesn’t travel much, it might be ok. A really decent approach to DIY this approach is located at Jalopy Journal. Being vinyl can be bought anywhere for such a project, the sky is the limit as far as color goes. Even blue sparkle is available.

For a more robust tuck and roll, which uses hidden stitches and heavier thread, a couple of automotive books come to mind. The Auto Upholstery Handbook by Don Taylor is a good one, as is Custom Auto Interiors by Ron Mangus and Don Taylor. There are a number of ways to approach tuck and roll. One could either sew the pleats and stuff, or actually tuck under and roll over the foam (depending upon ones sewing machine and skills).

The key though, with any of these approaches is small scale testing first. You dont want to spend a fortune on material, only to find out its no where near as good as its specs would lead one to believe. (assuming the material you get actually has a spec sheet). Ideally all automotive upholstery would be UV stable, fire retardant, abrasion resistant, and water resistant, but after market wise, specs can be all over the place. A good engineering reference for vinyl is ASTM D3690 which you can either purchase from them, or acquire from a large university library (older versions are likely more than adequate. Granted, for most folks, even boutique builders, ASTM quality standards would be overkill.

Its the same deal with the foam… there are hundreds of types of foam, and the cheapest you get from a discounter is unlikely to be the optimum long term. For engineering specifications wise, ASTM D3574 is key, albeit there is a lot of material going far beyond the needs of a speaker cab.

Lastly, should one wish to take this on, there is the issue of equipment and individual skill development. The learning curve can be a bit steep, so its always best to start out small scale first should one wish to revive this very unique approach to amplifier and cab covering.

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Ron Amundson on February 4th, 2011

Damian Erskine over at notreble.com has some excellent tips on how to gain fretboard knowledge. A lot of folks struggle with this. A lot of bass instructors struggle with how to teach it too. The big deal, is one approach doesn’t work for all students, even though the desired outcome is the same.

Personally I really like Damian’s approach, but I think a lot of that might do to the fact that I think in patterns… and have caught myself on more than a few times visualizing my fretboard should I be asked what notes are in a Gb-7b5 chord, albeit for more common keys, its automatic.

Some students on the other hand, might best approach this using a series of flashcards to get the note knowledge down for each chord, and then following such up with exercises on the fret board.

Another approach I’ve found helpful for some over the years is to grab a series of melodies, and have the student play them successively starting on each fret position. The next thing to do, is to tell them they just had a string break, and they need to play the melody missing a string (in each individual fret position). A final progression for students with 5 or 6 string basses, is to assign one string as a drone, and then have the students play the melodies, all the while keeping the drone going. Obviously one doesnt do this all in one session, nor make it the main focus for an extended period of time… but too slowly add fingerboard knowledge as the students experience grows.

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Ron Amundson on February 2nd, 2011

Massive scaling was the big carrot of record deals. The proverbial work once, and sit back to reap all the rewards based upon the initial investment is something venture capitalists dream of all the time. Being practical though, almost always there is some level of incremental investment in each successive sale. A more realistic model would be to put in a lot of effort once, followed by a nominal amount of effort for each additional sale.

After reading Derek Sivers blog entry Valuable to Others or Just to you, I got thinking… can I make a list of seven or so tangible items which can serve to expand the canvas. More so, can I do this such that most of the value returned is a function of initial investment, sort of like the record royalties of old?

1. Instructional videos showing how to perform your music. It may be individual instruments, it could be technology, it could be special effects… there are many possibilities here. For sure, one riff could be covered in a freebie video on youtube, and then one could charge for a video teaching an entire song/album.

2. Guitar tabs and/or sheet music (which aligns with the recorded performance) I’ve seen numerous requests for this on youtube… Sure, someone else could do this, and make it available for free. However, if direct from the artist, such could provide significant value to a dedicated fan. It wouldn’t scale as well, but signing and numbering each tab/sheet would likely add even more value.

3. Backup tracks in a number of different keys… such would be really easy to do, even if each needed to be individually mastered. Many who bought the album, and then wanted to sing along with it, would gladly pay for such an offering.

4. Online master classes (they scale much more so than do private or even group lessons in person).

5. Custom sheet music arrangements made to order (for choirs and mixed instrumentation) Finale and Sibelius can make short work of such an offering. Granted, this doesnt scale as well, as its a made to order thing… otoh, 80% of this could be done once, the rest is custom orchestration.

6. Ringtones… easy to make too, again a very nominal upfront investment in time to make this happen.

7 Fan generated merch and contests. This is just creative marketing of what one already has… some fan might well come up with the next great thing merch wise, if you give her the tools to make it happen. Rather than a tshirt bundle, include an image file on your cd, include some heat transfers of your logo, and a fan page to submit photos of their creative endeavors. If one adds in the potential to even cross sell such merch between the creators, and to the public, a whole other market opens up. One could even set up some type of revenue sharing arrangement.

The biggest issue for almost any of the above is going to be the marketing of such. Creation wise, most any musician can do so, or they could hire someone to walk then through it, or even outsource it completely. The marketing is the tough part… but since one is already marketing their CD or downloads, any incremental revenue brought in by co-marketing is just icing on the cake… or in some cases, it might well be the whole cake if one uses free downloads for the music itself.

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