Kurzweil PC3A6 [61/423] Kb3 program structure

Kurzweil PC3A6 [61/423] Kb3 program structure
6-6
Program Mode
KB3 Program Structure
KB3 Program Structure
There’s nothing quite like the sound of the classic Hammond™ B-3 tone wheel organ, especially
when played through a Leslie™ rotating speaker system. We’ve done extensive testing and
analysis with several tone wheel organs, and created our own models to emulate the unique tone
wheel sound. We even took into account the way that older organs start to sound dierent (and
arguably better) as their capacitors begin to leak—and we included a parameter that lets you
vary the amount of grunge (leakage) in your sound.
KB3 programs use oscillators to emulate the tone wheel sound. Each oscillator operates
independently, and has its own pitch and amplitude control. You can control how many
oscillators are used for a KB3 program. There are two oscillators per voice, for a total of 256. You
can use up to 91 of them in a KB3 program (the 92nd is reserved to produce key click). Because
the oscillators start running as soon as you select a KB3 program, there are always voices
available—unlike VAST programs, which start “stealing” notes when you reach the polyphony
limit.
The oscillators—we’ll call them tone wheels from here on—are divided into an upper and lower
group. The upper tone wheels use the samples in the PC3A’s keymaps to generate sound, while
the lower tone wheels use sine waves. You can change the keymap of a KB3 program’s upper
tone wheels to produce a large array of sounds. By changing the keymap from sine to a saw wave
it is possible to emulate the sound of classic combo organs like the Vox™ and Farsa™ models.
KB3 programs are also routed through vibrato, rotary speaker, preamp and distortion eects, see
below for details.
KB3 Mode
KB3 programs are dierent enough from VAST programs that we use the term KB3 mode to
describe what’s going on when you play a KB3 program. Whenever you play a KB3 program,
you are in KB3 mode. The blue LED in the KB3 button will light when the current program is a
KB3 program.You can play KB3 programs only on a single channel at a time.
If you want to create your own KB3 program, start by editing an existing KB3 program.
KB3 Effects And Real-time Controls
You have real-time control over many components of KB3 programs directly from the front
panel. The sliders emulate the drawbars that are so essential to the tone wheel sound, while the
buttons above them (the Bank Buttons) can control the KB3 eects: Leslie, vibrato, chorus, and
percussion. When using a KB3 program in Setup Mode, you must set the Mutes parameter to KB3
Control in order to use the Bank buttons for controlling KB3 eects (see Mutes on page 7-66 for
details.)
Drawbars
One of the standard performance features of many tone wheel organs is the set of drawbars for
emulating the stops on a pipe organ. Moving the drawbars controls the amplitude of either the
fundamentals or the harmonics of the notes. The PC3A’s sliders serve as the nine drawbars found
on most tone wheel organs. Pushing the sliders up is the equivalent of pushing the drawbars in
(removing fundamentals or harmonics).
Subharmonics Fundamental Harmonics
16’ 5
1
/3’ 8’ 4’ 2
2
/3’ 2’ 1
3
/5’ 1
1
/3’ 1’
Slider A Slider B Slider C Slider D Slider E Slider F Slider G Slider H Slider I
Table 6-1 Standard Drawbar Settings for the Hammond B3

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