Good to know there's a new hdspm driver being worked on. I've only had limited success using alsamixer to change settings on HDSPe MADI cards. I've found amixer and alsactl (both CLI) more useful here. I made a web page describing their use with the HDSPe MADI: http://www.jrigg.co.uk/linuxaudio/hdspe-madi.html Much of it should also be applicable to the HDSPe AES32 (allowing for different parameter names and channel numbers). John