snd_gf1_adlib_write
extern void snd_gf1_adlib_write(struct snd_gus_card * gus, unsigned char reg, unsigned char data);
snd_gf1_adlib_write(gus, 0x04, tmp >> 2); /* timer 2 start */
snd_gf1_adlib_write(gus, 0x04, tmp >> 2); /* timer 2 start */