Is anyone successfully using this controller keyboard with linux audio apps? I just got one and wondered if anyone had experiences to share. I might be sending mine back. I haven't turned it on yet, but some of the buttons stick very badly. There are 4 function buttons on the right side, F1-F4. F3 and F4 are stuck down completely. F1 and F2 come back up if you wiggle them a little. I've never owned any type of keyboard before, but this just doesn't seem right. Besides build quality issues, has anyone tried one of these with any linux audio software? Thanks, Eric Rz.