I think the easiest way to manage FM on pc at a really cheap cost (just 15$).
The man who runs that editor is really kind.
Roland Promars. E-mu EMAX I and II. Access Virus TI Snow. Yamaha DX7, DX7 II FD, DX27S, Roland JP8000, D10, JX-8P. Korg POLY800, DW8000. Casio CZ1000, Casiotone MT-70, SK1 (lost in my house), Commodore C64 w/ prophet64. Akai S3000 XL HD. KURZWEIL PC1x