As mentioned earlier, my initial goal is to be able to play a stereo sound file (e.g., a wav file) via the first two ADAT channels of the first ADAT interface on the Digi9652. If I run aplay -D hw:1,0 file.wav I get: aplay: set_params:891: Access type not available I suspect that some kind of data format conversion may be necessary to yield correct output but I'm not sure. Also, I searched the WEb for the above error message but wasn't able to find any information. The Digi9652 is recognized as card 1: aplay -l [lists card 0, followed by] card 1: R15 [RME Digi9652 (Rev 1.5)], device 0: RME Digi9652 (Rev 1.5) [RME Digi 9652 (Rev 1.5)] Subdevices: 1/1 Subdevice #0: subdevice #0