Curious what output level others find is optimal on norns? Mine set at @ -15 db seems to provide a clear, undistorted sound. With various engines (PolyPrec, Passersby, Molly), moving up creates distortion (breaking up).
Example
Playing melodic sequence (at various note velocities), break up at:
PolyPerc: -13.49 db
Passersby: -12.04 db
Molly: -9.46 db