Alesis S4 Plus - S4 Plus Signal Flow; The Four Sounds of a Program

Editing Programs: Chapter 6
S4 Plus Reference Manual 47
• When you want different sounds to respond to different MIDI channels.
S4 Plus Signal Flow
The Four Sounds of a Program
Each Program is made up of at least one to four sounds. A sound is made up of
several components including a voice (the original sound material) which passes
through a low-pass filter and an amplifier. The voice, filter and amp modules each
have direct modifiers (Pitch LFO, Filter LFO, Amp Envelope) which affect how each
will function in the Program. You can layer these sounds together, or divide them into
regions of the keyboard, or a combination of these things.
The following diagram illustrates the signal flow within each S4 Plus Program.
Voice Filter
Assignable Modulation Sources
(velocity, aftertouch, modulation wheel, pitch bend, etc.)
Range
Sound 1
Sound 2
Sound 3
Sound 4
MIDI
Input
Pan Output
Sends
1—4
Main L
Effects
Level
Effects
Buss
Main R
Aux
L
Aux
R
Effects
Processor
(reverb, delay,
chorus, etc.)
Amp
Pitch
LFO
Filter
LFO
Amp
LFO
Pitch
Envelope
Filter
Envelope
Amp
Envelope
Let’s look at each module’s function in detail.