The block diagrams of the FM+ machines in the MM’s manual are not the best examples of graphic design.

Let’s use the FM+STATIC machine as an example:

It’s a 3-operator machine, with two modulators and the carrier.

The first modulator (MOD1) has controls for carrier:modulator frequency ratio (1FRQ), modulation frequency fine tuning (1FIN), feedback amount (1FB), and the combined level/envelope control (1ENV).

The second modulator (MOD2) has controls for carrier:modulator frequency ratio (2FRQ) and a combined volume/feedback control (2VOL).

TONE controls the frequency content from the output of the carrier.

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