200e

Maybe it was
> > a bug on mine?  Anyone else notice this?
> 
> I've not noticed this with two that I've worked with.

Hrm interesting,  the keyboard magazine 200e review mentions a similar 
issue on theirs to what I was experiencing so maybe some of the 260e 
modules are buggy?   It doesn't make sense to include a continuous 
mode if it pops every cycle.

260e Duophonic Pitch Class Generator
If the 260e weren't included in the system, few musicians would miss 
it. Its purpose is to produce Shepard tones, an acoustic illusion of a 
tone that rises or falls forever. The module can do this in either 
stepped or continuous fashion, but in continuous mode it glitches, 
which rather destroys the illusion.