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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