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Algorithm
An algorithm is basically an operator connection diagram which defines how the six sinewave oscillators are
interconnected. An operator can either be connected and used as a sound generator (carrier) or as a modulator. In
PX7 a carrier is shown with a filled background and a modulator is shown with a dark background with a frame. The
carriers are always routed directly to the Output in the diagrams. The picture below shows the connection principle in
algorithm 22 as an example:
Modulators
OUTPUT
Connections in algorithm 22
The PX7 features the same 32 algorithms as the original classic Japanese FM synth. Below are diagrams of the 32
different algorithms in PX7:
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
Select the desired Algorithm by clicking the up/down buttons.
D
A diagram of the selected algorithm is displayed above the Algorithm selector.
Feedback loop
Carriers
Audio output
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
Operators 1, 3, 4 and 5 are carriers (as indicated
by their filled backgrounds). They are connected
straight to the audio Output.
Operators 2 and 6 are modulators.
Operator 2 frequency modulates Operator 1.
Operator 6 has a feedback loop and frequency
modulates Operators 3, 4 and 5.
Note that even though Operator 6 is shown with
three separate output connections, it's the same
modulation signal in all three outputs.
OUTPUT
OUTPUT
PX7 FM SYNTHESIZER
7
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