Scaling - Kurzweil PC88 Musician's Manual

Zone Parameters
Controllers
The rest of the Controllers, which weÕll refer to as ÒSpecial FunctionsÓ, are usually controlled by
the PC88Õs Switch controllers, which weÕll get to momentarily:
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Scaling

After youÕve selected the MIDI command associated with a continuous physical controller, you
can modify the controllerÕs response similarly to the ways you can modify velocity response.
Refer to the graphs beginning on page 5-8 for illustrations of the velocity scaling parameters.
Ctrl Scale lets you amplify or diminish the action of the controller. Full scale (0-127) is 100%.
Higher values will make the controller more sensitive, and lower values will make it less so.
Setting the scale to a negative number makes the controller action work in reverse. As with
velocity, you can use a controller to crossfade between two Zones by setting the scaling for one
Zone positive and the other negative. Maximum scale values are +300% and -300%.
Ctrl Offset adds or subtracts a constant to the controller, and at the same time sets minimum or
maximum values (thereÕs no need for separate Max and Min parameters). If the offset is 25, the
minimum value of the controller will be 25. If it is -25 (and scale is 100%) the Þrst one-Þfth of
the controllerÕs movement (25/127 = about 1/5) wonÕt do anything, and the maximum value of
the controller will be 102 (= 127-25). As with velocity, Scale is a proportional change to the
controller, while Offset is a linear change. The maximum values for Offset are ±127.
Ctrl Curve lets you taper the controller response. The default setting is Linear, which means
that the response follows a straight line as you move the controller. Sin+ sets the taper to
resemble the Þrst quarter-cycle of a sine wave, in which there is a ÒbulgeÓ as the response
5-14
Program Increment (Prog Inc) (132). Moving the controller takes the Zone to the next
highest Voice, and sends out the next highest Program Change number.
Program Decrement (Prog Dec) (133) takes the Zone to the next lowest Voice and sends
out the next lowest Program Change.
Goto Program (Goto Prog) (134). Selects an entirely different Voice for the Zone. The Voice
number is the On value.
Setup Increment (Setup Inc) (135) takes the PC88 to the next highest Setup, and sends out
all of the appropriate Exit and Entry values. When you change Setups, itÕs quite possible
that the Setup you go to wonÕt have the same controller conÞguration as the current Setup,
and that this command wonÕt be in the same place (or even present at all) in the next
Setup. Therefore you may only be able to use this controller once before it turns itself off
or turns into something else!
Setup Decrement (Setup Dec) (136) takes the PC88 to the next lowest Setup.
Goto Setup (137). Selects a speciÞc Setup. In this special case, the controller values are 1-
128, to match the Setup numbers.
Sequence Start (Seq Start) (138) sends out a MIDI ÒStartÓ command, which will set an
external sequencer connected to the PC88 to the beginning of its sequence and start it. (If
the sequencer is set up to accept external sync.) The tempo of the external sequence will be
determined by the settings of the clock parameters in the Global menu and the Tempo
setting.
Sequence Stop (Seq Stop) (139) stops any external sequencer.
Sequence Continue (Seq Cont) (140) starts an external sequencer from wherever it
happens to be. This is either where it was stopped by a Stop command, or where it was
sent by a MIDI Song Position Pointer message. The PC88 doesnÕt transmit Song Position
Pointers, but most sequencers do.
Transpose Up (Trans Up) (141) raises the pitch of the Voice, and also raises the MIDI note
numbers generated by the Zone. The amount of transposition is variable from 1 to 127.
Transpose Down (Trans Down) (142) lowers the pitch of the Voice and lowers the MIDI
note numbers.
PC88