CH_RSURR
chancfg_t ch_rsurr_5 = { CH_RSURR, NM_RREAR, 0 };
chancfg_t ch_rsurr_7 = { CH_RSURR, NM_RSIDE, 0 };
#define CH_5 (CH_STEREO | CH_CENTER | CH_LSURR | CH_RSURR)