CH_LSURR
chancfg_t ch_lsurr_5 = { CH_LSURR, NM_LREAR, 0 };
chancfg_t ch_lsurr_7 = { CH_LSURR, NM_LSIDE, 0 };
#define CH_5 (CH_STEREO | CH_CENTER | CH_LSURR | CH_RSURR)