Support multiple audio ports on Linux. Add vars: audioNCHANS, rtsetparams_called. Delete unused vars: old I/O buffers, rtoutswap Comment changes.
Support multiple audio ports on Linux.
Add vars: audioNCHANS, rtsetparams_called.
Delete unused vars: old I/O buffers, rtoutswap
Comment changes.

RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix,RTcmix/RTcmix