M13 Tuner Works Only With No Effect 4

[bradintexas]

My M13 only goes into tuner mode when there is no efftect 4 displayed. I'm running firmware V2.04

[JTSC777]

My tuner / tap tempo switch started to fail a few years ago and it made my M13 do a lot of strange behaviors like that. May be time to replace that switch.

[elliptic]

I have two M13s, on one of them the tuner works fine (although the box has other issues), but on the other the tuner button only works for some scenes. I thought it was the switch but I've now had all the switches replaced with heavy duty ones. In any case the tap function always works as expected, it's only with some scenes that the tuner button just doesn't work i.e. doesn't switch into tuner mode.

[elliptic]

So I did a bunch of testing and here's what I've found. I backed up my settings and loaded them on to the 2nd M13. It still worked fine, so it seemed to be a fault with the 1st M13.

 

More testing revealed that it was only on some scenes, and it was only if effect 1A was on. I mucked around and found that it depended on what effect was in 1A. For example Volume Pedal, Red Com and Blue Comp all work fine, but Boost Comp and Facial Fuzz don't.

 

I finally discovered that it has to do with how your expression pedals are assigned. I removed all assignments from the expression pedals, and the problem has gone, even after I put the expression pedal assignments back.

 

It seems like the software gets itself confused, but removing the expression pedal assignments snaps it out of it.