Here is how to recreate the bug:
1. press Transpose Down/Up and Hold button to initialize a program.
2. Set LFO1 destination to Osc1 Freq
3. Set LFO1 Amount to max
4. Set LFO1 Frequency to 58
5. Play the upper last octave of the REV2 keyboard
somewhere in the middle of this octave you'll start to hear the LFO acting strangely... it happens with all the waveshapes, and at any rate setting... at lower rates you can easily hear what is going on... the amount has to be quite high before it starts to break up, and the amount for that will depend on the waveshape you choose, but all of the waveshapes does this.
Another thing worth noticing is that the keys at which it happens seems to shift a bit... when you play over the bad keys, some of them start to sound right, then other go bad, and back again.
A really weird behavior, and certainly it must be a bug... can others reproduce this?