SNDRV_GF1_VB_VOLUME_END
snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_END, vol >> 8);
snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_END, 0);
snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_END, ramp_end); /* ramp end */