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Mine's got Groove MIDI and the timing isn't great. There are ways round how you play it. I've found if you hold notes down, adding new notes as you take different notes off it can help. It's a bit of a strange technique to explain! Another thing to try is putting "Hold" on - I've found that was the best way to use it on the Juno too - you will need to play around with the envelopes to get the best sound if you go down this route.
I've heard Groove MIDI's problem is that it uses up too much processing power of the poor old Jupiter 8's Z80 (same CPU as ZX81) - hence the Jupiter isn't quite as resonsive as it should be.
Groove MIDI isn't all bad though, one of the really interesting side-effects of it interfering with the arpeggio is that it sends the notes you play as an arpeggio out via MIDI so you can make some really, really interesting sounds if you plug it into some external devices (i.e. sampler).
Although Encore MIDI is supposed to be miles better, I don't fancy "un retro-fitting" the Groove MIDI, judging by the manual it's a very complex piece of kit.
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