AR_BCHAN_UNUSED
if (tgt[i].bChannel == AR_BCHAN_UNUSED ||
else if (hi == nchans || tgt[hi].bChannel == AR_BCHAN_UNUSED)
if (tgt[i].bChannel == AR_BCHAN_UNUSED ||
else if (hi == nchans || tgt[hi].bChannel == AR_BCHAN_UNUSED)
if (pierfreq[i] == AR_BCHAN_UNUSED ||
else if (*hi == npiers || pierfreq[*hi] == AR_BCHAN_UNUSED)