I noticed that executing the setPWM command has approximately a 32us latency. Which I guess would normally be fine, but if you're trying to use it to generate audio, this is too slow. You need to update the duty cycle of the PMW out faster than that. Or at least I would want it to be faster for my purposes. Is this expected?

I thought, at first, it was somehow related to the PWM frequency, but regardless of duty cycle and frequency the latency is about 32us. It is a very tight loop. The only other things in the loop take about 1us. The output pin in the code below is toggling at about 29KHz. When I comment out the setPWM it toggles at about 490KHz.

void loop()
{
digitalWrite(digPin,dig_output);
dig_output^=0x01;

data=testpattern[testdata_count];
testdata_count=(testdata_count+1)%624;

PWM_Instance->setPWM_Int(pinToUse, frequency, data);
}