AU_BUFFSIZE
if (sndbuf_alloc(ch->buffer, au->parent_dmat, 0, AU_BUFFSIZE) != 0)
return au_rd(au, 0, AU_REG_UNK2, 4) & (AU_BUFFSIZE-1);
i=au_rd(au, 0, AU_REG_UNK2, 4) & (AU_BUFFSIZE-1);
/*maxsize*/AU_BUFFSIZE, /*nsegments*/1, /*maxsegz*/0x3ffff,