On a different topic, do you test it on linux ? More than 4-5 voices start to crackle a lot. I think using this command lower them:
env PIPEWIRE_LATENCY=“1024/48000” ./4TRK
Edit: pinning to single core has the best results. → taskset -c 3 env PIPEWIRE_LATENCY=“1024/48000” ./4TRK
Have you tried anything else that works ?