This might be an old problem.
I have a EDIROL FA-101 firewire audio interface connected to my pc (winXP sp3).
It has 5 INs and 5 OUTs. I can see and activate them in my PD audio settings (standard MMIO) but when I click on 'apply' or 'ok' the console gives me this message: "separate audio device choice not supported\; using sequential devices.".
Going back into the audio settings there is only 1 IN and and 1 OUT activated.
Does anyone have a clue how to fix that?