Tiger itself runs okay (not well, but okay) on a G3, given enough RAM. TenFourFox was lethargic on my 500MHz Pismo when I was still using Tiger on it, but other stuff seemed to run pretty well. PPC-era VSTs usually have pretty detailed system-requirements information in the readme, anyway.

With music dealerships and second hands, it is a bit difficult where I live, it is easter europe, and people who have this old hardware like the yamaha synthesizers, keep them for themselves, since they are rare here.

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Ah, bummer. eBay's probably your best bet, then, though it couldn't hurt to keep an eye on other places (Craigslist has sites for some Eastern European countries, and maybe you have a local paper you could place an ad in?)