Sorry to dig up an old thread here, but it's time for an update.
I've been using the MP-2 with the GX-700 in a small, 2u rack into my Boogie combo for the last year or so. I have gotten my patches very refined (finally) and have a bank of patches for each guitar, enough for 12 guitars to have 10 patches each
So, I was experiencing some weirdness at a gig a few weeks ago. It quickly remedied itself when I cycled the power of the units in the rack, so i figured it was because of the heat (we were outside, it was near 100 degrees F). Well, it happened again at practice and I couldn't get it to stop. The effects unit (Boss) was switching effects on/off, cycling through patches, stopping for a second and doing it all again. It was horrendous and unusable. I ended up turning it off for practice and programmed 4 quick patches to get me through the rehearsal.
Before yanking the effects device out of the rack and swapping it with the backup unit, I just tried the midi cable from the other unit. It was fine, I suspect the cable is bad, so i bought another one, and so far have not seen the problem come back.
Since I had the other rig out of storage, I hooked it up and played through the MP-1 Classic for a change. GOD, I love the sound of this thing! It cuts through the mix like a cleave without a hint of screeching or fizzing (unless you want it that way, it'll go there). I love how easy it is to set up or edit a patch, compared to the endless button mashing of the MP-2 (i wish somebody had an editor program for that unit). The tones are more than fantastic, they are dynamic. I have a wider range of sounds (believe it or not) using only the three voicings in the MP-1 Classic. I don't get it, but it is super 'variable' in it's range. Picking attack is a breeze, which takes a bit of effort with the MP-2.
I'm totally on the MP-1 Classic train now. I'm digging everything about it, it's a joy to operate and to hear. I'm smitten