[sdiy] FM Sytnthesis, was: Yamaha PSS460 users?

[jbv]

>
>
> Some good books to learn more about FM synthesis:
>
> Yamaha DX7 Digital Synthesizer
> Yasihiko Fukuda, 1984 Amsco Publications
> softcover 139 ppg, ISBN 071190653X
>
> FM Theory and Applications - By Musicians for Musicians
> Dr. John Chowning and D. Bristow, 1986 Yamaha Music Foundation
> hardcover 195 ppg, ISBN 4636174828
>

Are these books still available (reissue) or only as 2nd hand ?

Do they cover such topics are multi-operator FM (more than 2) ?
I'm actually looking for (simple) litterature on multi-op FM,
like block diagrams, to test the more interesting algorithms...

Thanks,
JB