Dave Smith Instruments SYNTHESIZERS

Another Osc. 4 question, ha!

Last night while programing on my DEVO, I noticed that when I told 
Osc. 4 not to track the keyboard (i.e. Glide set to OFF), it did not 
respond and continued to track pitch coming from my midi controller. 
All the other oscs did as expected when their Glide was set to OFF and 
stayed on the same pitch no matter what note was being played.

However, when I set the transpose (Xpose) to OFF (i.e. Key off for all 
oscs), Osc. 4 stopped tracking pitch. 

I turned my evolver off and on and reset it as well, but the problem 
was still there. I checked all the mod slots and there's no stray 
controller telling Osc 4 to track pitch.

Can someone tell me what might be wrong? Or is this bug repeatable on 
other evolvers?

Thanks!