- The Yamaha PSS-480 is a real FM synth (2 Op) that was marketed more as a toy than a real synth, but it is a real synth and you can store 5 custom patches. Even though it’s only 2 Op, it has a real charm and can make some pretty unique sounds. There’s also MIDI in and out, and 12 voice Polyphony. You can usually find them from $50 to $100.
- The FB-01 is a monster of a synth in a tiny box. It’s a 4 Op FM synth, similar to the DX21, but relies on an external editor to edit patches. Fortunately there is one on sourceforge that runs on both Linux and Windows. I just picked one of these sweet babies for only $45!
Of course you can still pick up the Yamaha Reface DX at a good price if you want something new and compact. They are quite good at reproducing the Yamaha FM sounds and they’re under $300 brand new!