Some features are disabled in mute-mode to make sure you will not accidently save, download or comment on a different jamtrack from the one you are currently hearing. You may either lift the mute-mode to download or interact with the currently displayed remix, or move to the currently playing track with the green GOTO button.
Take 2...in stereo! I just changed the type of channel I imported the original track into, so the bass part didn't change at all, just the quality of the original instrument parts. I wish I could just delete or edit the first track I uploaded, but it looks as if that isn't an option (at least, that I can figure out).
How do I find more tracks featuring a musician I like?