Yamaha synthesizers MSX compatible

And you could give a try with the Yamaha PSS-170, it should sound familiar since it embarks an YM2413.

The FM-PAC has two waveforms, the DX7 has only one. I think the DX7 can't exactly mimic that second waveform the FM-PAC has, though I've never really tried.

Programming FM with any Yamaha DX or TX is likely to give you headaches, even top models such as the expensive and rare DX1, why not take the easy route? Buy a master keyboard (a.k.a. MIDI keyboard or USB-keyboard), and use FM8. I'll guarantee you that FM8 is fun and a DX is horror. Just check out www.youtube.com/mvsmsx to hear examples. The main improvement, which is in fact the improvement that makes FM understandable, is the free/custom algorithms. Problem with the old DX/TX models is that you can grab any preset sound, tweak some operators and then totally not understand why the sound changes as it does. But ok, you somehow remember that operator 3 changes some kind of brightness. Then you pick another preset, try to change it again and then operator 3 suddenly does nothing remarkable. Because the DX7 has tens o' algorithms, it's no wonder most DX7's that were returned to the factory for maintenance still had all the original presets in it.

And yes: I've the frontrunner FM models from Yamaha myself: the FS1r, SY77 and DX7, they can't hold a candle next to FM8, not even a tiny match. In fact, I think FM8 can mimic MSX FM sounds quite easily (it does have that second FM-PAC waveform and a fader to add some lo-fi grittiness).

If you want 80s technology, then FM8 is not your thing. Also, FM synthesis is not for everyone. For easy-to-use retro sounds, why not buy a Roland MT-32? It's super clean and easy to use, and all the sounds go nicely together.

Don't forget the DX7 uses up to six operators in a number of different algorithms (combinations of carrier/modulators/routes), so it is likely to be able of cloning the YM2413 waveforms (might be a headache though).

My FS1R does it well but it's another story... up to 8 operators with several waveforms to choose from (not taking into account the other 8 operators used for vocal synthesis).

Still haven't tried to mimic the MSX fm on my Alesis Fusion. It does 6-op FM synthesis but its approaching is rather different than the Yamaha DX-series or the NED Synclavier.

Wolf, in several discussions here, you say that MSX Music have an extra waveform per operator but i can't find any info about it.
Could you explain this a little more or point me to the right documentation.