In Documentation/sound/README.OSS was a remark saying noone was sure the mixer on the PCM1-pro worked with the ACI driver. Well, it does. I've been using the drivers for the MAD16 and the driver for the mixer since kernel 2.0.32 with a MiroSound PCM1-pro and it works great. I've got it working with the following configuration: MAD16 audio I/O base = 530 MAD16 audio IRQ = 7 MAD16 Audio DMA = 1 MAD16 MIDI I/O = 330 MAD16 MIDI IRQ = 9 And I've enabled the ACI mixer (miro PCM12) . Bas van der Linden.