Written as an attempt to sync my instruments (TR-606, SQ-1) to my OpenBSD machine with sndio. Not tested nor supported on any other OS. Listens to audio from microphone jack and prints custom messages to stdout when the amplitude crosses a certain threshold. Stereo aware in both input and output.
make && make install
Might have to be root for installing.
bang <left cutoff [0,255]> <right cutoff [0,255]> <left message> <right message>
The program will listen to the audio input. If the average amplitude of a channel's sampled window is greater than the specified cutoff, then its associated message will be displayed.
A channel can be ignored by specifying "-" as its message.
The program is written to track square shaped pulses, which it should do okay. Try adjusting the input volume if you're having trouble following the signal.