I have one, it shows up as 4x4 under jack and works fine so far, haven't tried pushing the limits of latency USB inputs 1 + 2 come from hardware inputs 1 + 2, USB inputs 3 + 4 from the master bus note this can be configured differently but only with software available on windows and mac be aware this causes an issue with the smaller unit, the Notepad 5 - it has only 2x2 and the master bus is the default USB input, this includes the USB output, it means e.g. any monitoring (e.g. click-track) will be recorded! you can change that to hardware inputs 1/2 via windows or mac but then it goes back to master bus next time it is powered up been in contact with Soundcraft support months ago, they are aware of the issue and promised a firmware fix but nothing so far - I'd wait before purchasing that one if you planned to use it for recording under Linux. -- Sent from: http://linux-audio.4202.n7.nabble.com/linux-audio-user-f5.html