Can you be more specific?
If an LFO is controlling DSND and reaches the maximum value (-64 or 64) and you have feedback up AND you have the channel’s (“machine’s”) level way up (among other things like DIST), clipping/distortion can occur.
Be sure to take your channel’s level down and fool with the DIST setting. Negative values of the latter can alleviate many distortion or fidelity-related problems.