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  1. Replies
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    Wow. So you wouldn't have to repeat the code for...

    Wow. So you wouldn't have to repeat the code for each voice?! This sounds awesome. Looking forward to trying this out when I get home.
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    @wrightflyer What exactly would it mean to have a...

    @wrightflyer What exactly would it mean to have a multi-voice audio tool? I know a lot of folks have built poly synths using the current library, myself included, that could be considered...
  3. Aha!!! 48 hours of debugging has finally paid...

    Aha!!! 48 hours of debugging has finally paid off.

    It turns out I had a couple redundancies in the setup function that were causing a big pileup of MIDI data. Basically I was doing an initial...
  4. Sure. I have several LEDs in the circuit that...

    Sure. I have several LEDs in the circuit that flash when the program is running (LFO indicators). When I load the program, they all go out immediately. The serial monitor logs the first few things...
  5. Thanks to you both for the feedback. I tried...

    Thanks to you both for the feedback.

    I tried to extract the offending piece of code from a much larger program, but I'm realizing I left out a lot of context. (I never know exactly how much...
  6. Also, here's a video of the synth/controller, if...

    Also, here's a video of the synth/controller, if it helps visualize what I'm trying to do.

    https://www.youtube.com/watch?v=VpGOdtfuOTQ
  7. Here's the full code repo. ...

    Here's the full code repo.


    The problem lies in the updateSlider function. I can send MIDI pitch bends over 8 channels with USBMidi, no problem. But when I attempt to do that over the serial...
  8. Hi Pete, That code was a bit messy. Sorry...

    Hi Pete,

    That code was a bit messy. Sorry about that. I just cleaned up the typos.

    The code reads the values of 8 different sliders and sends a MIDI pitch bend to 8 different channels based...
  9. Help with MIDI Controller: Trying to send pitch bend over 8 separate channels

    I'm running into an issue in a MIDI controller project I'm working on. I'm trying to make an MPE controller that will send pitch bend data over 8 channels of MIDI. But for some reason, I can only...
  10. This looks really cool. Thank you for sharing...

    This looks really cool. Thank you for sharing your work!
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    Genius. That's all it took. Thanks @kallikak.

    Genius. That's all it took. Thanks @kallikak.
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    Help with Sawtooth LFO Indicator

    Hi everyone,

    I'm trying to figure out something really simple--how to light an LED indicator proportionally to a Sawtooth LFO. So at the beginning of the wave, the LED would be completely dimmed,...
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    I was just trying to figure this out in another...

    I was just trying to figure this out in another thread.

    I don't have any leads based on poking around in the waveform object, just wanted to say it's something I'm interested in as well.

    Anyone...
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    Edit: There was no popping on those waveforms. ...

    Edit: There was no popping on those waveforms. Just my own bug in the multiplexer code. I spoke too soon.

    Again, thank you for your explanation and for your work on the audio library! It makes...
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    Thanks so much, Mark! So in practice, sampling...

    Thanks so much, Mark!

    So in practice, sampling a square wave (or any waveform with high harmonic content) at 44.1 kSPS will reflect harmonics that should be above our hearing range back into the...
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    Bandlimited Waveforms and Aliasing

    I've seen a lot of posts about band-limited waveforms reducing aliasing and generally sounding a lot better than the standard waveforms in the audio library. I must say using the standard audio...
  17. Thanks, Mark and Jonathan! I went ahead and...

    Thanks, Mark and Jonathan!

    I went ahead and added a read function (same as your getGain function) to the envelope.

    Now the question is, can I get a value from a waveform object that I could...
  18. Read Functions for Audio Waveform and Envelope Objects

    Hi,

    I'm working on a synth build, and would love to add some LED indication for the envelopes and LFO. Would it be feasible to add some kind of read function to the waveform and envelope objects...
  19. Update: I just got the boards in today and the...

    Update:

    I just got the boards in today and the 2x20 pin with all grounds on one side is working great.

    24171

    Very clean signals from the MUXs.

    Thanks everyone for your help.
  20. Replies
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    Ah! Thank you. I just added that third...

    Ah! Thank you. I just added that third regulator.



    Knocked them down to ~100uF.




    I decided to put a voltage divider on the mute circuit based on this guy's recommendation. He says it...
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    Here's my attempt at building a PCM5102A into the...

    Here's my attempt at building a PCM5102A into the board with a Teensy 4.1.

    I think I have the Teensy pins correct, but I need to buy a pre-made board and double check it before printing this one. ...
  22. Good call. I guess there's no real reason to...

    Good call. I guess there's no real reason to skimp on pins, and it seems like 40pin is a more common size than 24.
  23. Huh. I wouldn't have thought of using GPIOs as...

    Huh. I wouldn't have thought of using GPIOs as extra grounds. My current ground is just running from the voltage regulator.

    What exactly would using the GPIO's ground accomplish? In general is...
  24. Thanks, Mark. OK, so perhaps I just need to...

    Thanks, Mark.

    OK, so perhaps I just need to intersperse ground signals and logic signals and all will be good.

    I don't think the signals will be particularly fast. I'll probably poll the MUXs...
  25. Will this work? -- Connecting two boards using IDC Cable.

    Hey all,

    I’m starting to lay out PCBs for a Teensy synth and I wanted to see if I have a fundamental flaw in my design before I get too far. Any advice would be greatly appreciated. Here are the...
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    Ahh... good point about the layout and schematic...

    Ahh... good point about the layout and schematic in the datasheet. That's handy.


    23918
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    OK, great! Thank you so much. I'll probably...

    OK, great! Thank you so much.

    I'll probably end up laying it out on the board just because I could use the practice with PCB design.
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    Thanks, Frank.

    Thanks, Frank.
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    OK, great! Thanks for weighing in, Paul. I...

    OK, great! Thanks for weighing in, Paul.

    I guess I'm just confused on what's going on with a breakout board like the one that PaulS linked. (The other PaulS.). If I can connect the PCM1502A with...
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    Sounds great! Any ideas where I could look to...

    Sounds great! Any ideas where I could look to find a proper schematic to use a PCM5102A with a Teensy? I'm hoping to integrate it into the PCB instead of buying a breakout board.
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    Help me decide on a DAC for a poly synth

    Hi Teensyers,

    I'm building a Teensy poly synth and would like to figure out how to build out my own DAC hardware. Here's a pic of the prototype board. Currently using the Audio Board, which...
  32. Sorry for the delayed response. I think that a...

    Sorry for the delayed response.

    I think that a relay (or pair of relays) is the only way I can conceptualize getting the PTT to work. Thanks for that idea. I'm not really well-versed in analog...
  33. Oh, ok. So the host pins are for powering and...

    Oh, ok. So the host pins are for powering and communicating with external "devices" plugged into the teensy. Thanks for the explanation WMXZ.
  34. Teensy 4.1 Breakout -- Power and USB question

    Hi all,

    I'm building a synth with a Teensy 4.1 and have a question about power and USB. I'd like to have my breakout board feature an external USB B connector where I can program and get...
  35. "1970's planet CB *social media* was hugely...

    "1970's planet CB *social media* was hugely entertaining. Hooked up guitar multi-effects, yeah , waa-waa, fuzz, flanger whatever so all "on - air" setting up/testing was dumped into a 50 ohm dummy...
  36. Thanks so much for all the info! I think you're...

    Thanks so much for all the info! I think you're right, that maybe the way to go is building the circuit into the actual mic instead of a standalone unit. I'm having a hard time getting my head...
  37. Hey, thanks for the response! Yeah, ...

    Hey, thanks for the response!

    Yeah, apparently they used to put analog delay in old CBs back in the day as a kind of identifier for your voice.

    The CB is a Cobra 29, with a 4 pin aviation...
  38. CB Radio Effects Unit. Can anyone help with a wiring puzzle?

    Hi Teensyers,

    Im working on a maker project for a friend, but am having a hard time figuring out some technical details. If anyone has any ideas on how to solve this problem Id be super...
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    OK. That's what I thought I understood from...

    OK. That's what I thought I understood from Paul's comment on Teensy midi page.

    For newer Teensy boards with 3.3V signals, 74HCT4051 chips are best. Power the 74HCT4051 from 5V. If 74HC4051...
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    Thanks! I'll plan to change the bias on that...

    Thanks! I'll plan to change the bias on that 74HCT4051 chip to +3.3V instead of 5V and keep everything else the same.

    Appreciate it.
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    Multiplexer Wiring

    Hi all,

    Would someone be able to confirm this wiring for an analog multiplexer (74HCT4051) circuit with the Teensy 4.0? I would be reading from potentiometers biased at 0 and 3.3V, but powering...
  42. OK. That's really helpful, Paul. That seems...

    OK. That's really helpful, Paul. That seems like a obvious way to start troubleshooting that I didn't think of--just breaking the whole thing into parts and tuning or recording each individual...
  43. OK. So setting lineOutLevel to the maximum value...

    OK. So setting lineOutLevel to the maximum value seemed to help a lot. There's still the same resting noise, but the signal to noise ratio is much higher now.
  44. Thanks for replying, Paul. Here's the source...

    Thanks for replying, Paul. Here's the source code and answers to your questions inline:

    do you have any flashy lens (neopixel or ws2812s or anything like that?)

    No, nothing like that connected...
  45. Hey Mark. I'm actually not convinced that it...

    Hey Mark. I'm actually not convinced that it makes much difference in my case.

    Here are some audio samples I just recorded.

    It looks like:

    -running the sketch with...
  46. Awesome. I'll definitely try disabling that...

    Awesome. I'll definitely try disabling that software filter. It sounds like I'm having the same issue as the person who wrote that.

    Thanks!
  47. Ahh... Good to know about the MUX. I'll either...

    Ahh... Good to know about the MUX. I'll either buy the Sparkfun version or just buy the component and work it into a PCB.
  48. Nice. Thanks, y'all. I'll check out that...

    Nice. Thanks, y'all. I'll check out that 74HC4067 and the Sparkfun analog MUX.

    Mark, I was just looking at your project. Really amazing work! I'm most impressed by the neatness of your...
  49. Sharing some work and asking a couple questions

    Hello all,

    I just wanted to share a project that I completed a while back with the help of a lot of people on this forum. (Thank you!) It's a Teensy synth that has an experimental interface--...
  50. Thread: IO Question

    by toutant
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    Fortunately I think there's a good amount of...

    Fortunately I think there's a good amount of wiggle room in terms of accuracy/refresh rate/resolution for any of these analog inputs. (An LFO rate knob doesn't need precise 1024-value resolution...
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