StringForChannelType
B_MEDIA_RAW_AUDIO, StringForChannelType(buf,
StringForChannelType(buf, src), B_GAIN, "%", 0.0,
B_MEDIA_RAW_AUDIO, StringForChannelType(buf,
chan, dst), B_MEDIA_RAW_AUDIO, StringForChannelType(buf, dst),
const char *StringForChannelType(char *buf, int type);