Hi Daniel et al, I have successfully interfaced the sdr-widget with Linux alsa-driver for ASYNC OUT with rate feedback. Found out after much trial and error and reading of the usbaudio alsa-driver source code that you are using 12.13 as the format for the feedback rate !!! I was trying with 10.14 (UAC1 v1.2 specs , I think) in 3 bytes, and 16.16 (USB 2.0) in 4 bytes for quite a number of days with no success !!! However, 12.13 in 4 bytes, whilst working like a charm with Linux, does NOT work with OSX. Would you know the format used by OSX? Thanks. Alex _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel