Control Sources
4-1
Chapter 4
Control Sources
Control sources are assigned as values for control source parameters, like Src1 and Src2, Depth
Control for Src2, and LFO rate control. Assigning a control source to one of these parameters is
like connecting control source outputs to various inputs on early modular synthesizers. You can
think of each control source parameter as the input to a synthesizer module, and the values for
those parameters as the outputs of modules generating control signals.
For the control sources to have an effect, two things have to happen. First, the control source
must be assigned as the value for (patched to) a control source parameter like Src1. In other
words, for a control source parameter to have an effect, it must be programmed to respond to a
particular control message. Second, the control source must generate a signal. The level of the
control sourceÕs signal determines how much effect it has on the control source parameter to
which itÕs assigned.
In terms of generating signals, there are two types of control sources. The Þrst, which might be
called hardware control sources, require some physical movement to transmit them. The control
source called MWheel (MIDI 01) is probably the most prominent example of this type of control
source. When you move your MIDI controllerÕs Mod Wheel, it sends a Modulation message
(MIDI 01), unless youÕve programmed it to send something else. By default, when the K2600
receives a MIDI 01 message, it responds by sending a control signal to whatever control source is
assigned as the value for the MWhl parameter on the MIDI-mode RECEIVE page. Of course,
you can program the MWhl parameter to send any available control source signal in response to
MIDI 01 messages.
Some of these hardware control sources have physical controls Òhard-wiredÓ to transmit them.
That is, there are certain physical controls that
always
generate these control signals. Every time
you strike one of your MIDI sourceÕs keys (or pluck a string, or whatever), for example, a
Note On message is generated, along with an Attack Velocity message. So any time you strike a
key, any control source parameter that has AttVel assigned as its value will be affected by the
Attack Velocity message. Similarly, every time you move the physical Pitch Wheel, a PWheel
message is generated. Whether this affects anything depends on whether you have assigned any
control source parameters to respond to the PWheel message (in other words, whether any
control source parameter has PWheel assigned as its value).
In the Setup Editor youÕll Þnd several parameters that correspond to the standard physical
controllers found on many keyboards. These parameters and their default values are listed in
Table C-1 on page C-2. The values you assign for these parameters determine which control
messages will be transmitted to the K2600 and to its MIDI Out port when you move the
corresponding controls on your MIDI source. If you look at the WHEEL page in the Setup
Editor, youÕll see that the parameter called MWhl has a default value of
MWheel
. You can
interpret this as follows: ÒMoving the Mod Wheel on my MIDI source sends the MWheel
(Modulation, MIDI 01) message to the K2600Õs sound engine, and, if the K2600Õs LocalKbdCh
parameter matches my controllerÕs transmit channel, also sends it to the K2600Õs MIDI Out
port.Ó
If you change the value of the MWhl parameter, the Mod Wheel will no longer send the MWheel
message, and any control source parameter with
MWheel
assigned as its value will no longer
respond to movement of the Mod Wheel. All of the control assignment parameters in the Setup
Editor can be programmed to send any of the MIDI controller numbers. For example, if you
assign
Foot
(MIDI 04) as the value for the Press parameter, then generating mono pressure
messages from your MIDI source will send a Foot (MIDI 04) message to the K2600Õs sound
To Next Page
Need help?
General