ESM_MIXBUF_SIZE
es->mixbuf->buf.addr, ESM_MIXBUF_SIZE/4, /* in words */
es->mixbuf->buf.addr + ESM_MIXBUF_SIZE/2,
ESM_MIXBUF_SIZE/4, /* in words */
es->mixbuf = snd_es1968_new_memory(chip, ESM_MIXBUF_SIZE);
memset(es->mixbuf->buf.area, 0, ESM_MIXBUF_SIZE);