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  1. Hi JohnEVI, What is a "powerboard case"?

    Hi JohnEVI,
    What is a "powerboard case"?
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    actually, I had to change fmult max to: if...

    actually, I had to change fmult max to:
    if (fmult > 2965372) fmult = 2965372; // fmult <= 0.7, to allow q to go down to 0.5 instead of 0.7

    This means with 4x oversampling Fc max is about 20kHz.
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    I've made a couple more hacks to this so it works...

    I've made a couple more hacks to this so it works better for my purposes:
    1. I changed void AudioFilterStateVariable::update_variable to use 4x oversampling instead of just 2x;

    old 2x code...
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    Ok, so after analyzing filter_variable.cpp, I...

    Ok, so after analyzing filter_variable.cpp, I fixed the problem with the noise.

    I made a couple of changes to filter_variable.cpp
    First, I uncommented line 42 to define...
  5. Thanks Paul. Do you think this will help with...

    Thanks Paul. Do you think this will help with the harsh noise that happens with this filter?
    See the following thread...
    https://forum.pjrc.com/threads/67358-AudioFilterStateVariable-unwanted-noise
  6. Hi MarkT, I did finally see that it was 2x over...

    Hi MarkT,
    I did finally see that it was 2x over sampled, but I figured it would just adjust the parameters accordingly and run the simpler code. But the musicdsp.org site had some more...
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    Apparently, there is a limit to the F after the...

    Apparently, there is a limit to the F after the calculation F = Fcenter*2^(signal*octaves).
    in

    void AudioFilterStateVariable::update_variable(const int16_t *in,
    const int16_t *ctl, int16_t...
  8. Ok. I found some explanations here... ...

    Ok. I found some explanations here...

    https://www.musicdsp.org/en/latest/Filters/92-state-variable-filter-double-sampled-stable.html#state-variable-filter-double-sampled-stable

    the extra code...
  9. AudioFilterStateVariable: why is the code written twice?

    I've been looking through the code for the AudioFilterStateVariable (...\Arduino\hardware\teensy\avr\libraries\Audio\filter_variable.cpp), trying to understand the filter better.

    the part that...
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    AudioFilterStateVariable unwanted noise

    I'm getting a raspy noise from the AudioFilterStateVariable under certain conditions.
    (I'm using a Teensy 4.1 with TEENSY4_AUDIO adapter board).

    when the combination of the freq control input,...
  11. Thanks MarkT, for the information. It looks like...

    Thanks MarkT, for the information.
    It looks like the difference is just 4 files (3 changed files and one new file).

    data_bandlimit_step.c
    keywords.txt
    synth_waveform.cpp
    synth_waveform.h

    I...
  12. Has this bandlimited version been incorporated...

    Has this bandlimited version been incorporated yet?
    If so, how might one get it installed?
    (i'm new to this, so forgive naive question.)

    thanks,
    tim.
  13. SOLVED the problem: I found another post someone...

    SOLVED the problem:
    I found another post someone solved a similar problem.
    I just had to use:
    MIDIDevice_BigBuffer midi_ho(myUSBHost);
    instead of:
    //MIDIDevice midi_ho(myUSBHost);

    I had used...
  14. USB Host on teensy 4.1, doesn't receive midi from EWI 5000 usb

    I'm able to get my teensy 4.1 usb host to receive midi from a keyboard controller (12Mbits/sec),
    But I can't get it to receive midi from my EWI 5000 through it's usb connection.
    the EWI 5000 is 480...
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