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Hey there Paul. How goes it in Portland? Do you now if there is still a source out there for Oleg's original designs? The circuitsathome link seems to be a dim distant memory now unless I'm missing a hidden link somewhere.

Do you mean the full sized (UNO shaped) board? There is no doubt that they work for the most part but the issue is the small USB host boards made for the Arduino Pro Mini profile (more specifically the clones of them that have flooded the market). The original design seems to have been just...

Not sure that you are responding to me on this one but just in case you are, I've done all of that many times over and tried it on just about every USB device I have. If it will only work on some random USB device I haven't seen yet then it really isn't of any use for anything. Infuriatingly a...

I have gone through everything I have been able to find on the web on these things (seven host boards in all). I have done the bypass of the power. I have clamped the reset with and without pull up resistors, 1k and 10k. I have set up with 470uf capacitors for surge buffering as per Pauls...

This doesn't actually work. It get you as far as the diags of the internal functions of the chip and I have never had trouble with that. It runs all of the stages of the tests but it stops short of actually connecting to anything plugged into the USB which is where most of the trouble is. I...

OK, Just downloaded and installed it in my test Teensy and I'm really starting to hear it. The self oscillation is there at a level that to me is actually preferable to the real beast. That's just a personal preference though. The rest of the range is starting to get the warmth that I was...

Probably is a good idea to check on that to cover yourself but the Moog design is over 50 years old now and should be well and truly out of copywrite. The circuit diagrams are out there for free download and there are a lot of copies of the design being made, some good, some bad. As for some...

Thanks for sending this Paul. At this point all I can say is that I'm fairly impressed. I set up a testing Teensy for this last night and I can say you are certainly on the right track and I can now see that this could possibly be doable. More range is needed on the resonance though and that...

Never is a lot of info about these devices (it's my one major malfunction about these powerful little things). It's a shame that there isn't a source list of pdf files detailing the current understanding of them and containing the current programming syntax. I think they would develop far...

WOW. Forget all that. I have tried to get this thing to work about 8 times over the past 7 months with the same problems over and over again. The first time I bite the bullet and post a help request and all of a sudden, within minutes the next upload WORKS dammit. Now I bet am going to spend the...

More possibilities... I don't know if this will help (or if you have moved on from this) but I suspect I am getting the same problems as the OP and might have details he missed. The setup I am trying to startup has the Teensy 4.0 with a "Featherwing" ILI9341 touch display. The Arduino IDE is...

Would be great,...if.. The Moog filter would be a fantastic addition to the library. I have wished that was there ever since I started messing with Teensys. I even think the option would be worth a bit of greed for resources. The only thing that has ever made me question the idea is that...

Thanks for the heads up. That's my weekend taken care of.

Thanks for that Paul. I wound up using an AD420 which should do the job for the 16bit for a couple of bucks more than the DAC8565, er..bit and a couple of 12bit units I got from China for next to nothing. No loss though. The DAC8565 will be well worth it for other parts of the system and will...

You're welcome. It was surprising how little there was out there about control voltages but since it is basically an old analog synth consideration it isn't that much of a surprise really. Sheesh! Kids today just don't know their born!! :rolleyes:

Really nice design and clean finish. Hope you made it possible to add a few more oscillator controls. It's very similar to the one I have been building off and on. With similar complexity I have gone to 8 note poly as 3 modulated waveform objects as the core oscillators with 1 PWM, 1 FM and 1...

Yep! I'm setting up a MIDI to CV converter for an analog modular system (with 3 or four Teensy based modules thrown in) so I think I'll just have to go for a DAC tacked onto a cheap and nasty STM32 Blue Pill. I wouldn't want to waste a Teensy on that but since I'm intending to make Eurorack...

Excellent! Thanks for that.

Like I said, we'll get used to it and adapt and new users will simply be blown away with the new capabilities the same way most are when they meet first meet Teensy. (There was an 800Mhz Arm CPU from several years ago I was thinking of tracking down. I'm a little surprised that no-one has done...

I have been trying to setup a decent control voltage conversion into and out of microcontrollers on and off for a while now. Getting a decent and responsive signal out to audio modules and other systems has become a bit of a white whale for me. I can get a signal out of a PWM with a low pass...

I was thinking down the same path as you I suspect. Still, I am still stumped as to why he doesn't put out a decent PDF manual on the essentials of these boards. You know, pinout descriptions, more detailed specs for us plebs and details about any additions made to the Arduino language. He...

It is looking interesting Mr Stoffregen. I wonder why you changed the pinout arrangement towards incompatibility with the old audio board and what the "Digital Audio" pins on the pinout map are intended to be used for. While I am at it, could there be a 32bit version of the libraries in the...

Unfortunate that the pin allocation was re-arranged. I'll just have to bodge up an adapter. What I am most curious about are the numerous "Digital audio" pins on the board pinout map and in what way they are implemented.

Just received my Teensy 4.0. Looks interesting but can't do much yet. Is there any information out there yet on the specs of the audio implementation on the board or how to get the audio card going with it? Fingers crossed that we get better and more centralized documentation for this...

OK. Did a compile this morning in Debug mode and most problems went away except for the failing mixer set (with only a brief assessment) and the lack of signal from the line-in. The discrepancies in the multiply objects seem to have cleared up in this mode very well so that everything that is...

I gotta admit I'm not even a tech trained guy (which explains why I should be watched and corrected).

I wouldn't even have thought of that almost one step upgrade without you hitting me over the head with the obvious. Thanks much for that. It hasn't solved the problem completely but it has at least eased my decaying mind that it isn't necessarily something that I have missed in my coding. I...

About LTO? In the Arduino IDE with Teensyduino "Tools" menu under the "Optimize" branch where you can set the compilation options (for what I assume is the compression level of the uploaded code for memory conservation) there are options that I haven't seen before like "Fast", "Fast LTO"...

OK, it was an informative weekend. On the suggestion of Defragster I did an overdue reinstall of the Arduino IDE to version 1.8.5 (from 1.8.1) and put in your latest Teensyduino 1.4. The results were quite an improvement. With a default compile (Faster I think) the volume levels have now...

I gotta get less sloppy with my postings here. Yeah, I should have said that the peak was around 50%. It was Idling at about 48%. There is about three obvious and simple lines of code at the top of the loop section of code about half way down the listing that I'm pulling those figures from...

It would be the previous version of TeensyDuino before the recently released (1 before 1.40 at the moment) and the latest Audio library downloaded as a zip from Github. I've been updating the lib as soon as it comes out rather than full IDEs to keep track of the bug fix listing. I'll update...

Hey Paul, hows the marathon treating you? Hope you are getting some holiday time. Yep. I put that in the cluster of info at the top of the code... CPU consumption sits roughly at a stable 50% or less in this setup. Audio MEMORY peaks at 192, idles at 168 ...derived from the simple code at...

So, no opinions out there? None at all? :(

Update with more info First off the Midi library I am using is version 3.2 and not 2.4 as I said before (is there even a 2.4 out there?). Also, my apologies for putting up the current full code listing but simpler versions haven't had the same patterns of problems. It seems that as soon as I...

I've been developing my synth project for a while now and have had some ongoing problems that I just can't iron out after trying for months. The description of these are in the top of my following code listing. I was hoping to post this when I had my code better documented and cleaned up more...

It works fairly well. I have used the Arduino Uno sets to set up my Teensys 3.2, 3.5 and 3.6 for prototyping but have had to cut and sand the pin headers a little to make them fit end to end for the length, not to mention a side shaving giving it a bit of clearance around the BGA processor so...

While coding for my synth project I was a little surprised (only a little) to find that there doesn't seem to be any kind of event feedback from the envelope. At first I thought it would be good to have a marker at the end of each stage of the envelope cycle to trigger other events but on...

I've always found a bit more drain from my various Arduino based projects than I liked but pretty much took it for granted but now that you mention it I am going to have to give it a decent analysis. It's got to be something to do with my build habits. The thing that was happening with...

Excellent mate! I gave it a quick test drive this morning and it did the trick very nicely. It was agonizing working out how to apply it to code taking all of 90 seconds and two sips of coffee. For those who are curios it was simply... long n = 10; // 10 being the shift of ten bit long...

Back when I was using the 10K pots I did get intermittent cross talk at worst. It was more a curiosity than a concern at the time. I put it down to possible bad connections but changing the pots cured it. Having that go away with the 1Ms was pretty much just a pleasant bonus. As far as the...

The code I put in my second posting is what I am using at the moment which is just five pulls on the pin in a loop. At a rough test a while back it seemed to do the trick better even than just putting in a delay. (Don't worry, makes no sense to me either but there it is.) I've got to do an...

Fantastic. That's the kind of starting point I was looking for. Thanks for that.

Yeah Paul. I was wondering about that the other day. Odd I'd never actually thought about how a log pot was set up before but then over the years I have only used them rarely. A stepped/layering approach to the track makes perfect sense. I have been using them to graduate the slope of the...

I tried quickly testing it with my old CRO and came to the conclusion that it had to be the way the ADC was seeing things but it couldn't hurt to check again more carefully with a multimeter. I've been tinkering away at this thing for months and I gotta admit I've taken shortcuts. BTW, kudos on...

Thanks for the brilliantly rapid response Theremingedieur. I think I should have been more specific. I've been in a bubble with this thing for some time now and forgot that my info might not be complete or made better sense outside of my head. (I was also hoping not to bore anyone with a...

Hey folks, I've been working on a synth project with the Teensy 3.6 and Audio card (fantastic work Paul S. by the way, greatly appreciated) and I have hit a problem with potentiometer accuracy. The pot doesn't return a linear response to the system making it very tricky to set a half turn point...