inrepos is superceded by
rtinrepos. There is no equivalent
for outrepos in RTcmix because of the way the
scheduler works, The alternative is to use the scheduler to
set the timepoint for output-writing.
From the source code:
int outrepos(int samps, int fno)
samps = # of samples to move forwards or backwards (negative) in time
fno = open soundfile number
Both functions return a pointer to the file being operated upon, or exit on failure.