FMHeaven

This is a really venerable FM Synth, with a solid implementation of DX7 patch format. Consider that if you buy this, you can scour the net for literally 10s of thousands of patches, since this reads all .syx DX7 patches (I haven't found one it can't read yet).

I created a Python program to parse the patch name out of the file, and currently (although there are a lot of duplicates) my spreadsheet of patches is just over 104,000. I think that ought to be enough for anyone. If I live long enough, I'd like to rationalize the collection by type of patch, type of operator algorithm, etc. Maybe someone has already done that and I just haven't found it yet.

It seems to be a little unstable in Live 9.7 on Windows 7 Pro 64-bit; sometimes it hangs and sometimes checking the "HQ" box and playing notes hangs it. But what do you want for cheap? It might even be that version 1.4 is better than 1.5; I haven't investigated it yet.