There are a few ressources cited in this forum. Take the time to discover FM synthesis before you buy the synth, maybe: your ear might be more disposed to hear what you understood.
First thing first: the Tao of FM Synthesis made it seem simple to me
Then you got a lot of links in different topics:
This is a bit deeper, but Gordon Reid’s SOS articles are still very relevant to learn any aspect on synthesis, IMO…
