Hey @C0d3man,
I’m not sure which setBfreak synth you have tested with, I have tried ‘setBfreak Tonewheel Organ’ but even before the sound reaches pisound, it usually has corruption at the hit and release of a MIDI note. The difference between HiFiBerry DACs could be different sampling rate (pisound runs on 48kHz instead of 44.1kHz), so the plugin may be behaving unexpectedly? The issue I observed though reproduced also when Jack was running using 44.1kHz sampling rate.
Anyway, I have captured the jack’s audio output using jack_capture, and found that having plugged in just the setBfreak Tonewheel Organ in MOD, it produces corrupted audio, before it reaches the sound card. In the Audacity’s screenshot below, I have marked the weird waveforms.
We have tried other kinds of synths other than setBfreak and we didn’t notice anything abnormal.
Could you show us a screenshot of your setup? Also could you try capturing a sound sample of the issue?
Thank you,
Giedrius.