So, Line 6, any more ideas about this ? This distortion (check out the previously uploaded files) is now occurring just about everytime I use the looper.  It seems to be associated with pressing the REV button while in Overdub mode.  Do I have a faulty unit, or is it a s/w bug (? can be fixed in the next upgrade).  Can you reproduce this fault?

Stephen

Hugo,

Have a quick listen to the attached short wav  file which demonstrates the nature of the problem well.  I first  recorded a silent loop, then pressed overdub to add a pure tone, then  pressed reverse to produce the glitchy repeat.  I did this first using  very low pitched, then higher pitched sine waves.  So, you first hear  the original signal, then the glitchy OP from the looper.  The first  attached jpg file ('M9 Looper - Original and Glitched Waveforms') shows  nice graphical waveforms of the original, then the glitched waveforms  (low pitched only).  This should help your engineers to work out what's  going on.

But the crux of all this is that I have finally  discovered how to reproduce the glitching with 100% repeatability.   Begin recording a loop by pressing REC/OD, then end loop by pressing  REC/OD again.  Then press REV and add new material to the loop.  IF  THE TIME BETWEEN PRESSING REC/OD THE 2ND TIME AND PRESSING REV IS  SHORTER THAN THE LENGTH OF THE LOOP, THEN THE ADDED MATERIAL WILL  PRODUCE THE GLITCHING.  If the time between pressing Rec/OD the 2nd  time and pressing REV is longer than the loop length, the new material  will be glitch-free.  This is easy to understand if you look at the jpg - 'M9  Looper - How to produce glitching'

I hope this helps to solve the problem.

Regards,

Stephen