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I love my MMT-8, best sequencer i've used. The buttons were really in a bad way, and so i took some advice from a comment on this website and cleaned the contacts with an eraser, now they work at a feather's touch (almost, maybe a really heavy feather).
Try it too if you're having that problem, it's a very cheap way to solve it. Might not work for everyone though. Only attempt it if you're confident at taking things apart. It isn't difficult, but i'd advise caution. Don't touch anything you're not sure about. The buttons are on the front panel, which is connected by three ribbon cables, take them out, noting which way round they go, unscrew the button circuit, rub the eraser on all the square spiral shaped contacts, make sure the rubber bits on the back of your buttons don't have any crap on them, put it back together, and everything should be hunky dory. I'd recommend you save your sequences beforehand, to tape or sysex dump, just in case anything goes wrong.
Good luck.
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