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Hi JohnEVI,
What is a "powerboard case"?

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.

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...

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...

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

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...

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...

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...

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...

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,...

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...

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.

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...

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...