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Since the timbre of frequency modulated sounds can vary a lot depending on where on the keyboard you play, it is
necessary to be able to scale the envelope generator's modulation amount differently across the keyboard -
especially for operators that work as modulators in the algorithm. The figure below shows the principle:
99
+LIN
+EXP
DEPTH 0
-EXP
-LIN
99
LEFT CURVE
C0
C1
C2
• B.P.
The B.P. (Breakpoint) parameter is used for defining the desired "center" key on the keyboard. On either side of
the breakpoint you can have different curves and depths.
Range: A-1 to C8
• Depth
The Depth parameters defines the scaling amount and can be set differently for the right and left curves on either
side of the Breakpoint key.
Range: 0-99
• Curve
One of four different curve types can be selected for the left and right curves respectively:
-LIN, -EXP, +EXP and +LIN.
The figure below shows three examples of different Breakpoint (B.P.), Depth and Curve settings:
50
-EXP
D3
+LIN
99
0
99
C0
C1
C2
C3
C4
C5
C6
BREAK POINT
+LIN
+EXP
-EXP
-LIN
RIGHT CURVE
C3
C4
C5
C6
C7
50
0
-LIN
C2
99
0
99
C7
C8
C0
C1
C2
C3
C4
C8
+EXP
50
50
-LIN
99
0
99
C5
C6
C7
C8
C0
C1
C2
D5
-EXP
99
C3
C4
C5
C6
C7
C8
PX7 FM SYNTHESIZER
11
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