As stated above,
I found that any pitch shifting filter or harmonizer likes a really clean right hand. I personally find the most versatility for these sub octave pitch generators to be tonal, as tracking is a problem. If you think about it tho, tuning a 5-string below B is a daunting task and sounds like it ... not very good IMO

What I mean is, if your pedal shifts your note down an octave, shift your playing up an octave. I apply these octave pedals mostly in an electronica setting. I generally use the 100% octave down and 0% dry. I did own an M288 very, very recently

and it was replaced by Boss OC2 because the MXR BOD had a harsh tone to my ears even with the growl all the way out and girth all the way up. I guess I am after more of a sine wave tone.
Whammy 4 2-octave down sounds great. That range only gives me like an octave to work with. Right by the heel, and I'm fat, which doesn't help. Sorry I got a little off topic.
What type of riffs are you trying with the M288? I found that the game changes quite a bit once you engage the octave down.
Weird enough, I also found that the M288 tracks better with the tone all the way up! Totally counter-intuitive since it is a monophonic pedal and having the tone up would invite more harmonic content. Can anyone back up my assumption?
P.S. I hope you like the M82
