Operator Controls - Propellerhead PX7 Operation Manual

Op Feedback
In addition to the Algorithm selector is the Op Feedback knob. All algorithms have one operator with a feedback
connection (signal routed back to the operator's input), the Op Feedback knob sets the feedback amount.
Range: 0-7
• Increasing the Op Feedback level will produce a brighter sound, with more overtones.
• If several operators are used for generating the feedback signal, the result will be more complex signals - and
in some cases noise.

Operator controls

The PX7 features six identical operators (sinewave oscillators) which are all built up the same way, with the same
controls. Here we will describe the controls of one of the operators.
On/Off
Click to activate/deactivate the operator.
D
Fixed
Click the Fixed button to get a fixed frequency from the operator, no matter where on the keyboard you play.
D
This is mostly useful when you are using algorithms where the operator is used as a modulator.
Coarse
Turn the Coarse knob to set the coarse tuning of the operator.
D
If the Fixed button is off, the display shows the pitch ratio (partial), where 1.0 is the nominal pitch. 0.5 is an octave
down, 2.0 is an octave up, 3.0 is three times the nominal pitch all the way up to 31.0 times the nominal pitch.
If the Fixed button is on, the Coarse knob sets the operator's basic frequency to 1, 10, 100 or 1000 Hz.
Fine
Turn the Fine knob to fine tune the operator.
D
If the Fixed button is off, the display's value is shown according to the formula: Coarse * (1+Fine/100).
If the Fixed button is on, the Fine knob sets the operator's frequency between 1 and 9.772 times the currently set
Coarse frequency (see above).
Range: 0-99.
Detune
Turn the Detune knob to detune the operator.
D
The operator pitch can be detuned in even smaller steps than with the Fine knob.
Range: +/- 7 steps.
8
PX7 FM SYNTHESIZER