cmtconv is used to generate .wav files that can be played into
microcomputers. It can be handy to play these directly from your
development host, and even more handy to add an separate audio interface
(usually USB) to dedicate to this.
To load cmtconv output into your microcomputer from a Linux system, you
can list the names and numbers of your "sinks" (outputs), and then play the
file to a given sink (name or number) from that list with:
pactl list short sinks
paplay -d SINK …/….wav
Recording should be done not with parec (which always writes the output
in raw format) but parecord (use SIGINT to stop recording):
parecord --file-format=wav --format=u8 --channels=1 -d SRCNAME FILE.wav
The pavucontrol window can be used to view levels during recording and
playback.
- MAME Castool: Converts various formats (CoCo
.CAS, C64.TAP, etc. etc.) to WAV files for use with MAME. - minimodem: A command-line program which generates/decodes FSK audio at any specified baud rate using various framing protocols. Supports many standard FSK protocols, including Bell103, Bell202, RTTY, TTY/TDD, NOAA SAME, and Caller-ID. This can decode, at least to some degree, certain FSK cassette tape formats as well.