Rad_Randy

I know it's 7 months later, but If you still want to do this, I do too, if we can somehow figure out the logistics? I'm in Portland Oregon. I bought my floor unit at Guitar Center a month and a half ago (past 30 days, otherwise I'd just return it to GC and buy the rack). I also bought 2 years of transferable extended warranty The only Ownhammer it has is a freebie Mesa 2x12 cab. I think if you message me on PM it will send me an email, which I'll check sporadically for the next couple weeks.

I saw some for I think the Voodoo Labs Ground Control that were basically paper that you'd print out, with square pictures of say, a Tube Screamer or a DynaComp or whatever,then laminate, then cut out the individual squares and drill out the center button holes. Since the M13's buttons aren't round, you may have to do some Xacto work for the button holes they were attached to the face of the floor unit with ordinary 3M double sided scotch tape, which could be peeled up if you want to change things. Not as quickly changeable as your magnetic idea, but I don't actually know what's in the black box or how sensitive it is to magnets all over the surface. But the idea was the same, and it kinda looked like an array of individual stomp boxes

I think there is a filter called "sweep" (or something with a capital Q like "Q-filter") that is a wah you can set to one position with the FREQ knob, as long as the effect isn't assigned to an expression pedal (that'll make it a regular wah pedal). Otherwise, any EQ should work, whether graphic or parametric. (the wah is actually a parametric EQ) Set the main level of the EQ pedal to give a boost, then kick the treble on top of that to taste

Set each preset you want to use on the Nova to different MIDI channels. What the M series can do is send a channel change signal, but it can only do one channel per scene. On "scene setup" the lower right is MIDI channel number. When you select this scene, that channel number gets triggered by the Line6. So if scene1 is set for MIDI channel 1, and 2 for 2 etc, then your Nova has a sound programmed and saved to MIDI channel 1 and another to channel 2, then when you hit the footswitch to change to scene1, your Nova will do the program you set to MIDI channel 1, and when you go to scene 2, the Nova will do the program you set to channel 2 etc.

For a clean, no effect/no coloration boost, I personally go one of two ways: Volume pedal with the "minimum" knob set pretty high, to your "rhythm level" so you are basically pedaling from 7 to 10, and put it very last in the effects loop, just before the power amp. When the volume pedal is way back there, all the gain and tone shaping has already happened and you are just adjusting the final level, but not wrecking your delicious distortion sound like if the volume pedal is at the front end. I use a stereo volume pedal between the M13's output and the power amp's input. OR I haven't tried this because I just thought of it now, but you could use the expression pedal on the level control of whatever is your channel 4 effect (if your setup is 1>2>3>4). Since it's digital, it might be a pretty clean volume. Can't say, A - because I haven't tried it and B - because I'm too greedy to give up that effect slot for a freaking volume pedal. OR For more of a 'booster pedal' feel, use an eq set to flat response (all sliders at zero) but raise the EQ's main level. A lot of guitar EQ's will go 6 or 12dB, which is plenty when you're raising it just before the power amp at the end of the effects loop. If you hear ANY coloration when boosting, like a hint of treble compression or a slight boost in the bass, just balance it to perfection with the EQ sliders. One of my old Boogie combo amps has a built in EQ with a footswitch, but not a boost switch, so I actually have set the EQ sliders up about halfway between the zero midline and max (with some slight tweakage to make the sound perfect when boosted) so when I want a boost with that amp, I step on the EQ switch. The preamp section has bass, mid, treble, and presence, so I never knew what else to do with a 5 band eq on an amp that technically has a 4 band eq on the preamp already! But on my M13 setup into a stereo amp like your Rocktron, stereo volume pedal at the end of the loop going into power amp is transparent.