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  1. Replies
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    Another thank-you from me really helpful sorting...

    Another thank-you from me really helpful sorting out a question I had

    Cheers Paul
  2. Answering my own question here but might be...

    Answering my own question here but might be interesting to someone coming behind....

    To confirm, the MicroMod has all the pins exposed to run 4 channels in and out no problem using the standard...
  3. @grinch - there is also a schematic of the Teensy...

    @grinch - there is also a schematic of the Teensy 4 board here put there by another user along with kicad files, it may be useful.
    cheers, Paul
  4. Hi @dimitre In the example it is a circular...

    Hi @dimitre

    In the example it is a circular buffer designed to process a continuous stream of audio so when it gets to the end it just wraps around to the start again.

    In this example -...
  5. Hi Oscar, you could check out TyCommander...

    Hi Oscar,

    you could check out TyCommander I haven't used it with multiple Teensys and PlatformIO but other seem to have had success with it

    Cheers, Paul
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    hi @torché, I had a similar issue and concern,...

    hi @torché,

    I had a similar issue and concern, I ended up using a different codec (a wm8731) as although still SMD it's an easier package to hand solder.

    Some details in this thread...
  7. Hi, I've not used PSRAM but from what I...

    Hi,

    I've not used PSRAM but from what I understand that approach with EXTMEM should work.

    As long as you are not looking to 'save' you loops that approach with an array sounds good.

    It...
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    Thanks all, got that Paul. Posted question in...

    Thanks all, got that Paul.

    Posted question in usual way here.

    Cheers, Paul
  9. MicroMod Teensy - 4 Channel Audio / Custom Carrier

    Hi

    I want to use the MicroMod Teensy on an audio project. I've got it in the ATP carrier at the moment but planning a custom carrier with codecs for 4 output channel sound (only need 1 input).
    ...
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    MicroMod Teensy - help / issues etc

    What's the etiquette on T4 MicroMod questions / issues etc. - ok to ask here on the PJRC forum or is there somewhere in Sparkfun-land that should be using?

    Cheers Paul
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    * more to last - I believe WAV file player and...

    * more to last - I believe WAV file player and FFT will also fail at 16 sample per block.

    Also@jonathan's advice to try it, see if latency is too much and if so reduce the block size is a good...
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    I use AUDIO_BLOCK_SAMPLES of 16 for effects to...

    I use AUDIO_BLOCK_SAMPLES of 16 for effects to keep latency low. At that block size the only object I've found not to work is the USB audio out.

    I haven't been able to work out how to consistently...
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    Finally got a chance to check the video... Looks...

    Finally got a chance to check the video...
    Looks great ! A lot of work gone into that and sounds good, the front panel looks fantastic - love the real time controls.
    The serial data ports are...
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    Thanks @palmerr - sounds good, I'll have a go. I...

    Thanks @palmerr - sounds good, I'll have a go. I panicked and snagged a few off Mouser!
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    Anyone hand soldering these - are they ok to hard...

    Anyone hand soldering these - are they ok to hard solder?

    Been using WM8731 but need extra outputs and these look really good.
  16. Hi @jayshoe - thanks for those references. For...

    Hi @jayshoe - thanks for those references. For this use I don't need a balanced output just looking to lift the levels.

    If I was starting again and it wasn't for the chip shortage I'd probably use...
  17. T4 WM8731 Codec - Consumer v's Pro Line Level Output

    Hi

    Looking for a bit of help on what I hope is some basic audio electronics.

    I'm using a Teensy 4 with a WM8731 Codec (datasheet) in a custom effect unit.

    I'm using the line level out to...
  18. If there was a like button I'd press it - looks...

    If there was a like button I'd press it - looks great.
  19. Replies
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    I don't know about any issues with A8 on a 4.1....

    I don't know about any issues with A8 on a 4.1. but if I'm using pots with a multiplexer (and switching quickly between pots) I get much better results without the caps on the pots.
    Cheers, Paul
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    Hi, i think it's operating as intended,...

    Hi,

    i think it's operating as intended, certainly the way I thought it operated i.e. once you have set a stage that is it set until you change it and the stage is independent of others.

    I've...
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    Sampler Rate Reducer Effect

    I ported the sample rate reducer by Emilie Gillet from Mutable Instruments Plaits (via a port to DaisySP by Ben Sergentanis) to a stand-alone Audio Library object.

    There's a basic sample rate...
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    thanks - void arm_q15_to_float (const q15_t *...

    thanks - void arm_q15_to_float (const q15_t * pSrc, float32_t * pDst, uint32_t blockSize )
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    Thanks I'll try that Is there and arm_...

    Thanks I'll try that

    Is there and arm_ function to convert a block of int16_t to float?

    I should have said above I'm using a teensy 4, cheers Paul
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    The tone attenuation is on the feedback leg of an...

    The tone attenuation is on the feedback leg of an old reverb effect that I don't own so difficult to isolate.

    I have the a schematic of it so believe it is as spec'd above, cheers Paul.
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    Quick bit of feedback to say I got that working -...

    Quick bit of feedback to say I got that working - thanks for the pointers @Blackaddr and @WMXZ.

    I'm a complete noob at filter design so I'll capture a few notes here for anyone else coming behind...
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    Maxim do a range of digipots that you can use for...

    Maxim do a range of digipots that you can use for this. Also Microchip MCP42050 is popular.

    Discussion on subject in another forum might be of interest.......
  27. Sounds fantastic, well done, I bet it's been a...

    Sounds fantastic, well done, I bet it's been a labour of love and a whole lot of effort.
    Industrial design looks great also with the case and the buttons (is that an injection moulded case?), I...
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    Thanks, came across this...

    Thanks, came across this http://users.sussex.ac.uk/~tafj0/DSP_IIR.html which looks handy

    Cheers Paul
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    Hi, thanks for the pointers The issue with...

    Hi, thanks for the pointers


    The issue with the library one is the noted issue with low corner freq (<400Hz).

    I'll have a look at the CMSIS-DSP, I'm assuming I'd need to wrap that in a new...
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    sounds good, let us known how you get on , cheers...

    sounds good, let us known how you get on , cheers Paul
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    I'd recommend trying a bigger step size. ...

    I'd recommend trying a bigger step size.

    0.0001 is 10,000 steps and well beyond what you will be able to accurately measure on a pot (and I think what you will be able to hear).
    Midi CC moves...
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    Hi, You can change AUDIO_BLOCK_SAMPLES (which...

    Hi,

    You can change AUDIO_BLOCK_SAMPLES (which sets the block size (default is 128 samples, it is set in AudioStream.h).

    I generally use 16 which updates every 0.3ms.

    I still think you are...
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    Help with filter design

    I'm looking to emulate a tone control in a part of an audio effect. Trying to achieve specific low frequency and high frequency attenuation.

    The spec's I'm trying to achieve are 6db/octave...
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    Hi, your code is updating the object every cycle...

    Hi, your code is updating the object every cycle of the loop - on a teensy 4 this will be very often, if you update it less often does the problem go away? cheers Paul
  35. Hi Jeremiah, I'll give a few basic answers and...

    Hi Jeremiah,

    I'll give a few basic answers and maybe one of the experts can fill in the details.


    This code uses a wavetable (AudioWaveformSine). Is this absolutely necessary to achieve...
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    Hi, They are samples of (in this case)...

    Hi,

    They are samples of (in this case) different acoustic guitars.

    24461
    you'll find more details at the adventurekid website.

    cheers, Paul
  37. hi h4yn0nnym0u5e, This old thread ...

    hi h4yn0nnym0u5e, This old thread talks about dynamic connections, might be useful ? cheers, Paul
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    Hi, I didn't review in detail so may not have...

    Hi,

    I didn't review in detail so may not have understood the problem but it looks like you are using pins reserved for the audio board for other input

    A number of pins are not shareable for...
  39. hi, looks like you are setting the volume every...

    hi,
    looks like you are setting the volume every cycle of loop (rather than every 50ms) - that must be a lot of times a second, that might be a the problem?

    try changing that, press the button on...
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    hi philip if you unplug your amplifier do you...

    hi philip

    if you unplug your amplifier do you still get distortion through the headphones?

    other than that difficult to tell without any code (have you given it enough AudioMemory?)

    cheers...
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    Hi Richard Had a quick go with the FIR version...

    Hi Richard

    Had a quick go with the FIR version (your 1.5 + 36 taps). I couldn't get to to run initially which I now know is because I was running with a smaller than standard AUDIO_BLOCK_SAMPLES....
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    Richard - no, interpolating version is fine. I...

    Richard - no, interpolating version is fine.
    I don't understand the maths well enough on the latest (FIR LPF) to understand what latency would be.
    I'm interested in the filter for and effect unit...
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    @rvh - is there a useable version of the code...

    @rvh - is there a useable version of the code that I could try. I'd like to get a idea of latency and also to try with small block sizes. cheers Paul
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    @PaulStoffregen, spent a little time with the new...

    @PaulStoffregen, spent a little time with the new code on git, it sounded different, after a bit of testing it appears the code you've loaded on git for v1.4 is different to the code at #129 in a...
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    Hi Richard, yes passband_gain =0. I'll put a...

    Hi Richard, yes passband_gain =0. I'll put a couple of pots on input_drive and passband_gain and have a play with that. Cheers Paul
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    Nothing musical or scientific but a quick video...

    Nothing musical or scientific but a quick video of the code from #103.

    A little Moog Werkstatt with a simple saw wave through the Moog filter and through the teensy at various levels of resonance....
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    Hi Richard I had a quick try of your code from...

    Hi Richard

    I had a quick try of your code from #85 - sounds really nice. Certainly the closest I've heard to that moog sound on a teensy - thanks for the work on this I've been looking for a...
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    Paul/Richard - looks like great progress, can't...

    Paul/Richard - looks like great progress, can't wait to give it a try at the weekend and will be sure to give some feedback, cheers Paul
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    Hi Richard - I didn't realise that you were...

    Hi Richard
    - I didn't realise that you were modulating the cutoff - makes sense now
    - Easy audition - just in case you missed the intent of the files on GitHub - it is set up so that you change the...
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    hi @rvh when I was looking at this I thought...

    hi @rvh

    when I was looking at this I thought the AnttiHuovilainen was the most promising - I'm not sure I follow what you're doing with the coefficient code, i can't see what would change sample...
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