15
Reversing the Operation of Knobs, Wheels, or Faders
Most MIDI parameters assignable to knobs, wheels, or faders can be configured so that the control’s operation is
reversed. Once a control is assigned to a MIDI parameter, by default the Data 2 parameter defines the minimum
value (for example, 0) while the Data 3 parameter defines the maximum value to be transmitted (for example, 127).
Reversing the operation of knobs, wheels, or faders is achieved by entering a higher value for the Data 2 parameter
(usually minimum) and a lower value for the Data 3 parameter (usually maximum). This is useful when a single Fader
needs to be configured to work as a drawbar when controlling with an organ-based virtual instrument, or if a knob
needs to be configured in reverse when controlling a particular parameter. This requires two values to be specified
(values given are examples):
Key
Parameter
Value
Data 2 (example)
Minimum value
127
Data 3 (example)
Maximum value
0
The following example configures a Knob, Wheel, or Fader to reverse its operation:
1.
Press the Edit button.
2.
Press the Select button or Control Select (Ctrl Sel) key.
3.
Select a knob, wheel, or fader as detailed earlier in this guide.
4.
Press the Data 2 key.
5.
Enter 127 using the number keys. This configures the control to reach its maximum value when it is all the way
down.
6.
Press the Data 3 key.
7.
Enter 0 using the number keys. This configures the control to reach its minimum value when it is all the way up.
8.
Press the Enter Key.
The knob, wheel, or fader now operates reversed. What was originally the maximum position is now the minimum
position, and vice versa.
Limiting the Range of a Knob, Wheel, or Fader
The MIDI protocol allows for a maximum range of transmitted values between 0 and 127. The effective range of
values transmitted by knobs, wheels, and faders can be limited by entering values other than 0 and 127 (default) for
the Data 2 and Data 3 parameters. For example, with the Data 2 parameter set to 38 and Data 3 set to 93, if a knob is
set fully counter-clockwise, the lowest value it transmits is 38. If the knob is turned fully clockwise, the highest value it
transmits is 93. This can be useful in a variety of scenarios, for example, to keep a knob within the "sweet spot" of a
synthesizer parameter (for example, filter cutoff), or to quickly recall a specific minimum or maximum volume setting
for a track.
The following example configures a knob, wheel, or fader to operate within a limited range (38 to 93):
Key
Parameter
Value
Control Assign (example)
MIDI CC number
07 (Volume)
Data 2 (example)
Minimum value
38
Data 3 (example)
Maximum value
93
