CLOCK_MEASURE_BUFSIZE
memory = snd_es1968_new_memory(chip, CLOCK_MEASURE_BUFSIZE);
memset(memory->buf.area, 0, CLOCK_MEASURE_BUFSIZE);
apu_set_register(chip, apu, 6, (pa + CLOCK_MEASURE_BUFSIZE/2) & 0xffff);
apu_set_register(chip, apu, 7, CLOCK_MEASURE_BUFSIZE/2);
offset += chip->measure_count * (CLOCK_MEASURE_BUFSIZE/2);