Nice work, I especially like the backdrop for the main menu... so relaxing.
The peak meter at the bottom is a nice touch.
I like that eveything is very easy on the eyes.
The only thing, I think, that can be improved is the pixels of purple around some of the images. It seems like the background never changes so just don't put any transparent pixels in the images. It's hard to explain but make the background of the images the background the image is over.
You know what I mean?
Very good work though. Thumbs up.