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    Hi Fluxanode, depends on the library, lots of...

    Hi Fluxanode, depends on the library, lots of them do work without change - what library are you wanting to use?

    Cheers, Paul
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    hi jishnuch It looks as thought you are...

    hi jishnuch

    It looks as thought you are running PlatformIO on a Raspberry Pi - I'm afraid I have no experience of that.

    From your error messages the compiler is looking for the...
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    hi jishnuch compiling for 4.1 works fine for...

    hi jishnuch

    compiling for 4.1 works fine for me with the standard ini file like above.

    i'm using: Teensy 4.11.0 on a mac with macOS10.15.

    If you change the env to Teensy 4.0 does that...
  4. hi Dionysus - can you explain a bit more about...

    hi Dionysus - can you explain a bit more about your setup and what you're doing - are you powering other stuff from the teensy? - a picture would be ideal.

    A teensy and audio board on it's own...
  5. Hi UHF, I use the same mux and had similar...

    Hi UHF, I use the same mux and had similar periods of stability. I'd come back to it the next day and it would be erratic again needing long settle times.

    I thought it might be temperature...
  6. Hi @UHF Afraid I have no insights on the...

    Hi @UHF

    Afraid I have no insights on the memory issue but I've also been converting a project from 3.x to 4.x and your analogRead and Mux issues triggered me.

    After going round in circles for...
  7. Hi Jin, I used a WM8731 on a custom board, it is...

    Hi Jin, I used a WM8731 on a custom board, it is small but not too difficult to solder
    https://forum.pjrc.com/threads/60924-Audio-Board-Equivalent-for-Custom-PCB?p=244469

    Cheers Paul
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    Hi an envelope follower should not be...

    Hi

    an envelope follower should not be difficult - check this thread for a discussion and example https://forum.pjrc.com/threads/29579-Envelope-detector-and-VCA-with-Teensy-s-Audio-library

    I...
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    It's easy to change the number of samples in a...

    It's easy to change the number of samples in a block. I run my effects with AUDIO_BLOCK_SAMPLES set to 16 (one block = 0.36ms long).

    Smaller block sizes work with with most but not all of the...
  10. Hi RobertRobotics, For the Teensy 4.0 you...

    Hi RobertRobotics,

    For the Teensy 4.0 you need a Rev D shield - https://www.pjrc.com/store/teensy3_audio.html.
  11. Hi JayShoe an old thread that speaks to your...

    Hi JayShoe

    an old thread that speaks to your issue https://dsp.stackexchange.com/questions/3581/algorithms-to-mix-audio-signals-without-clipping

    I'd stick a peak object on each of your channels...
  12. Hi FinleyOderSo, can you throw up your latest...

    Hi FinleyOderSo, can you throw up your latest code with the changes you made, Cheers, Paul
  13. I use following with Teensy 4 which works for me ...

    I use following with Teensy 4 which works for me


    #include <WS2812Serial.h> // leds
    #define USE_WS2812SERIAL // leds
    #include <FastLED.h> // leds
    ...
    FastLED.addLeds<WS2812SERIAL,...
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    First go at a new board using the WM8731 codec as...

    First go at a new board using the WM8731 codec as suggested by @blackaddr, easy to solder and seems to work well, bit more testing to do.

    Used pretty much the application circuit from the...
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    I found these helpful: Grounding and Decoupling:...

    I found these helpful:
    Grounding and Decoupling: Learn Basics
    Staying Well Grounded
  16. Here's a simple modification of the standard...

    Here's a simple modification of the standard mixer with 10 inputs, cheers Paul

    20646
  17. Hi Holger, I don't want to hijack your thread but...

    Hi Holger, I don't want to hijack your thread but could I ask about you stereo > mono effect - are you just summing the channels like the mixer or something else? thank Paul

    PS I agree a...
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    Hi, you might want to check out...

    Hi, you might want to check out https://codeberg.org/dcoredump/TeensyMIDIAudio from user @C0d3man for a few ideas
  19. Hi lokki Good you got a fix. I'm no expert but...

    Hi lokki
    Good you got a fix. I'm no expert but looks like there is an influence from the oscilloscope impedance and your long cables as you've found with the cap but I can't say that I understand...
  20. that's quite a lot of reads a second - could you...

    that's quite a lot of reads a second - could you try 2 millis and see if that helps?
  21. @lokki, have you tried slowing your loop down? ...

    @lokki, have you tried slowing your loop down?

    I use keypad on a mac with a mag cable and on battery with no issues
  22. @alrj can you post some sample code that...

    @alrj can you post some sample code that reproduces your problem, it makes it a lot easier to help that way, cheer Paul
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    @blackaddr I've been looking at your schematic,...

    @blackaddr I've been looking at your schematic, which has been really helpful thanks for sharing it.

    I know your board is focussed towards guitars and has significant attention to that with the...
  24. Tops, thanks

    Tops, thanks
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    @blackaddr thanks for that, I'll look into...

    @blackaddr thanks for that, I'll look into WM8731, I can deal with TSOP so looks promising
    Your board looks great. cheers, Paul
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    As far as I know, the 1.8V supply is for VDDD,...

    As far as I know, the 1.8V supply is for VDDD, text below from the Datasheet, the max for VDDD is 2.0V-

    The SGTL5000 requires 2 external power supplies: VDDA and VDDIO. An optional third external...
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    thanks @boxxofrobots, not sure inside of a 70's...

    thanks @boxxofrobots, not sure inside of a 70's stereo was the look I was going for but thanks for the link to Jessa ;)

    doesn't look like many alternative options so will have a look into heat gun...
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    Audio Board Equivalent for Custom PCB

    I've built a custom effects board with Teensy and AudioBoard which has been great fun but the connection from the Audioboard to inputs and outputs are a bit of a mess.

    I know I could tidy up the...
  29. Hi, You need the Rev D for 4.1 ( from here...

    Hi,

    You need the Rev D for 4.1 ( from here TEENSY4_AUDIO Audio board for use with Teensy 4.0 - 4.1, (Rev D))

    There are other changes in pins between 3.6 and 4.1 so you might have to look at...
  30. I'm fairly sure the neopixels are ws2811s (rather...

    I'm fairly sure the neopixels are ws2811s (rather than ws2812s)

    The OctoWS2811.h lib is another of Paul's non-blocking libs that you can use with FastLED as in #5
  31. try #include #define...

    try
    #include <OctoWS2811.h>
    #define USE_OCTOWS2811
    #include <FastLED.h>

    in that order
  32. Hi, That's good lineOutLevel helps a bit....

    Hi,

    That's good lineOutLevel helps a bit. Couple of additional thoughts:

    Here is the text from the design tool on volume, might not affect you as i think you are using line out only (if so do...
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    beautiful looking custom keyboard and excellent...

    beautiful looking custom keyboard and excellent writeup of the process

    p.s. love T800 arm also :)
  34. @touting, couple of thoughts - do you have any...

    @touting, couple of thoughts
    - do you have any flashy lens (neopixel or ws2812s or anything like that?)
    - are you setting the audio board with any other functions?
    - are you using line out or the...
  35. Your synth looks great, nice work. On your...

    Your synth looks great, nice work.

    On your noise question have a look at this.

    Simply disabling the high pass filter on the audio board seems to help a lot (adcHighPassFilterDisable())
    ...
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    I made a (very) rough and ready AudioBoard using...

    I made a (very) rough and ready AudioBoard using FreeCAD (for the first time!).

    Zip file with the FreeCAD model plus a .wrl that you can use direct in KiCAD
    19948


    A picture of it sitting on...
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    for me there is clickable attachment at #7 with a...

    for me there is clickable attachment at #7 with a zip file with the filter_biquad_f.h, filter_biquad_f.ino and a test sketch - are you looking at it on a phone?
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    I came across this paper ...

    I came across this paper "Non-Linear Digital Implementation of the Moog Ladder Filter" (Proceedings of DaFX04, University of Napoli) by Antti Huovilainen and found an implementation for Reason JSFX...
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    It's a floating point (rather than integer)...

    It's a floating point (rather than integer) version of the biquad filter - see post #7
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    Thanks for these, I'd love a good Moog like LP...

    Thanks for these, I'd love a good Moog like LP filter and I had a play about with the sketch.

    I added a pot for cut-off freq and res and a couple of extra waveforms to thicken the sound for...
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    3d CAD Model for Audio Board / Shield

    Hi, has anyone come across a 3d model for the audioboard, looking to use it in KiCad but any 3d MCAD format would be great.
    thanks Paul
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    I agree but I still want more that 24 steps per...

    I agree but I still want more that 24 steps per turn :)
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    The problem I've had with encoders for audio...

    The problem I've had with encoders for audio effects/applications is the lack of resolution with a single turn - with 24 pulses per revolution you need to turn the knob 10 times to get 8 even bit...
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    hi @xtreemechill I'm no expert but a few...

    hi @xtreemechill

    I'm no expert but a few points just from my experience with pots and audio effects:
    - are you using the audioboard as part of your design, if so remember that will take out a...
  45. have you had a look at...

    have you had a look at https://www.pjrc.com/teensy/td_libs_AudioNewObjects.html
  46. Hi, if you upload the code you are using I'll...

    Hi,

    if you upload the code you are using I'll test it on a similar setup

    cheers, Paul
  47. Hi Have a look at @a_guy_called_tom's Polaron...

    Hi

    Have a look at @a_guy_called_tom's Polaron DIY Drum Machine - https://github.com/zueblin/Polaron

    He has created a custom Envelope using an exponential look up table, have a look at the...
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    Hi, I wired up a Teensy 3.2 with the DAC and...

    Hi,

    I wired up a Teensy 3.2 with the DAC and the first two examples above work fine.

    The last one (#5) doesn't work because you've got two connections to the dac (which only has one port) so...
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    @nubie I tried your code with a Teensy 3.6 with...

    @nubie I tried your code with a Teensy 3.6 with the Audioboard. I changed the dac for an i2s output and it works fine (sounds good!).

    I don't have the dac set up for audio out so can't test that,...
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    Try increasing AudioMemory() delay uses lots of...

    Try increasing AudioMemory() delay uses lots of memory.

    From the GUI:
    Memory for the delayed signal is take from the memory pool allocated by AudioMemory(). Each block allows about 2.9...
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