au_addroute
au_addroute(au, 0x11, 0, 0x58);
au_addroute(au, 0x11, stereo? 0 : 1, 0x59);
au_addroute(au, 0x11, 0x48, 0x02);
au_addroute(au, 0x11, 0x49, 0x03);