WAVCACHE_WTBAR
wc_wrreg(ch->parent, WAVCACHE_WTBAR + wtbar,
wc_wrreg(ch->parent, WAVCACHE_WTBAR + wtbar + 1,
wc_wrreg(ch->parent, WAVCACHE_WTBAR + wtbar + 2,
wc_wrreg(ch->parent, WAVCACHE_WTBAR + wtbar + 3,