1) audioplay usage has:
"-i header information\n\t"
(I think that is for audiorecord.)
2) play.c has -i to set iflag.
I don't see any use of iflag.
3) audioplay man page has:
.It Fl i
If the audio device cannot be opened, exit now rather than wait for it.
Are any of the three things correct?
Jeremy C. Reed