Well strictly no (but that shouldn't stop you trying
). If you could modulate the MP-1 chorus depth (auto-magically) then it would be a flanger of sorts.
Flanging was accidentally invented by someone leaning on a tape reel while it was playing (the same signal/track) as another tape was playing it (or aspects of it), you can get this kind of thing when you have 2 multi track tape recorders playing in sync (to get extra tracks (eg 2 x 16 track = 32, loose 2 to sync = 30 tracks to record on)), lean on one spool slows it down (delay + pitch shift introduced), vary the pressure = flanging (comb filtering, out of phase waves cancel each other).
So flange parameters are pitch (freq) and pitch modulation (up/down, rate/speed) and time (delay) modulation (usually very short so waves end up out of phase with themselves and thus cancel out and modulating faster/slower).
The MP-2 chorus however does flange a bit (it has different circuit), and also I find with my slant split stack I've wired stereo, it causes some flanging as the speakers are not separated/isolated (and thus some frequency dependent out of phase cancellations).