I traded in my MZ last May, so I'm not certain anymore about where to look for styles for Technichs or Roland, although I was able to download some from the net. I'll have to check because I have a new computer since then too, but If I still have thjem somewhere on disk, you are welcome to them.I think Gunnar Jonny ( who posts here often ) had some Technics styles on his site.
You cannot import voices or samples into either the 740 or the MZ2000. On the MZ2000, you can edit several synth parameters, envelopes, Lfos, etc on the MZ, but I don't think that would be all that useful for creating a tabla sound. You can't modify the 740 voices at all, except to assign the mod wheel to either one or two very basic synth functions.
best regards,
Krog AJ
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AJ