Dynamic Processing 181
Background
The Dynamic Processing section of the ESI-32 provides you with all the
intuitive control options of an analog synthesizer. But since you are
starting with complex, digitally sampled sounds instead of simple square
or sawtooth waveforms, the possibilities are multiplied dramatically.
Each of the 32 channels contains three AHDSR type envelope genera-
tors, one multi-waveform LFO with delay and variation, one 24 dB/
octave low pass filter (VCF) with resonance, one level VCA, one stereo
panning network, and an extremely flexible routing scheme which ties
everything together. The diagram below illustrates the layout of an
ESI-32 channel.
This block diagram illustrates the general architecture of the ESI-32. The dotted lines show how realtime controllers, envelopes and LFOs can be routed to
modulate the sound.
Each key on the keyboard can contain two zones (primary and second-
ary, just like samples), and each of these can have completely different
sets of analog parameters applied to it. The zone concept makes the
programming and modifying of parameters quite straightforward.
The Zone Concept
A zone is simply a selected range of the keyboard. That's it! Nothing
mysterious about it. Dynamic processing parameters can be programmed
for any range of the keyboard (zone) regardless of where the samples lie.
For instance, a completely different pan, LFO rate, and VCA envelope
can be set for each individual key, or range of keys.
Sound
Generator
Filter
(VCF)
VCA
L
R
Sound
Memory
SCSI
Floppy
Drive
Sample
MIDI
Filter
Envelope
Generator
Auxiliary
Envelope
Hard
Disk
Pitch Control
Mod Control
Pressure
Pedal
MIDI A
MIDI B
Velocity
MIDI Key
Pitch
Q Cutoff
VolumeTonePitch
Sampled Waves
LR
Volume
Envelope
Generator
LFO
Sample
Start
Depth Attack Attack Freq.
Pan
Stereo
Position
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