Kurzweil K2661, Musician’S Reference Manual

Page: 35 / 500

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 source’s signal determines how much effect it has on the control source parameter to
which it’s assigned.
In terms of generating signals, there are two types of control sources. The fi rst, 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 controller’s Mod Wheel, it sends a Modulation message
(MIDI 01), unless you’ve programmed it to send something else. By default, when the K2661
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 “hard-wired” to transmit them.
That is, there are certain physical controls that
always generate these control signals. Every time
you strike one of your MIDI source’s 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 you’ll fi nd several parameters that correspond to the standard physical
controllers found on many keyboards. The values you assign for these parameters determine
which control messages will be transmitted to the K2661 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, you’ll see that the parameter called MWhl has a default value of
MWheel . You can
interpret this as follows: “Moving the Mod Wheel on my MIDI source sends the MWheel
(Modulation, MIDI 01) message to the K2661’s sound engine, and, if the K2661’s LocalKbdCh
parameter matches my controller’s transmit channel, also sends it to the K2661’s MIDI Out
port.”