Hi! First of all, thanks for a great program! I made two patches for it: 1) make hearnet suid and drop privileges right after libpcap initialization. I had to move libpcap init code above jack So, you can use hearnet as regular user. 2) Mutex in jack_process is a very bad thing. Moreover, it seems there's no need for it, as voice->active field serves as a mutex. Attached patch removes pthread_mutex. If you think voice->active assumption is a weak one, the problem can be solved with a pair of jack_ringbuffers: one for free voices and one for active. Regards, Dmitry.