When playing fast on Mini v, in monophonic, it sometimes sounds like the filter cutoff gets higher and higher, as if the envelope level is cumulative when it's triggering over and over again quickly (without finishing the whole envelope cycle). i.e. you trigger a note and if it has a long filter decay on it and you retrigger before the decay has completed, the cutoff sounds higher than if you waited for the decay to finish.
Is this standard behaviour on the original hardware? I never owned one so can't tell.