After thinking about it, I think I like the original blue speaker concept (
#93) the best. Great job!
Also, I think #107 looks more like a crossfader, but I feel like it's still lacking something. I can't quite put my finger on it... but I can see it working and it's totally a creative approach. The fader itself is good, I think it's just the surrounding treatment to make it obvious that it is a crossfader. Any ideas?
-Bryan