I just got mine this week, and so far, I'm very satisfied with all of the editable sounds and easy-to-use sequencer. However, I found that the "Value" knob is quite loose, and can be "popped" off easily. Does anyone else have this problem? It doesn't appear to be broken or glued...Is this a common problem on all models? Thx...

Yep, that is a problem (at least with mine). I just picked it up three weeks ago and am very happy with the purchase, except for the fact that the Quantize knob has grown legs and dissapeared!! Been looking all over my house and still can't find the damn thing!!