Editing Programs: Chapter 6
S4 Plus Reference Manual 63
• Aftertouch Pressing on the keys after they’re down generates this control
signal. Aftertouch is also called channel pressure, and represents an average of
all keys being pressed. This affects any keys that are held down. The harder you
press on the keys, the greater the degree of modulation.
• Polyphonic Pressure This is similar to aftertouch, but each key can respond to
individual pressure messages.
Example:
Assign poly pressure to the sound’s
amplitude in a string ensemble patch. You can then increase the level of selected
notes of a held chord to “pull” some notes out of the chord.
• Pitch Wheel The two wheels typically located to the left of the keyboard are
modulation sources (see below). The leftmost wheel (or horizontal lever action)
usually controls the oscillator pitch but can be tied to other parameters as well.
• Modulation Wheel The rightmost wheel (or vertical lever action) is traditionally
assigned to LFO amount (level) so that rotating the wheel away from you
introduces vibrato. However, it is also well-suited to controlling timbre, vibrato
speed, and many other parameters.
• MIDI Volume MIDI can produce a variety of controller messages (see the MIDI
supplement in the back of this manual). Of these, controller #7, which controls
channel volume, is one of the most frequently used. Example: Assign the filter
cutoff as the destination, and you can have the signal become less bright as it
becomes lower in volume.
• Sustain Pedal The sustain switch (MIDI Controller #64) provides this modulation
signal.
• Pedal 1 The MIDI Controller (as defined in the Global menu) for Pedal 1
provides this modulation signal. Typically, this may be mapped to AENV Amp to
act as a volume pedal.
• Pedal 2 The MIDI Controller (as defined in the Global menu) for Pedal 2
provides this modulation signal.
• Pitch LFO This is the same modulation signal provided by the Pitch LFO. The
Frequency LFO and Amplitude LFO can also be selected as modulation
sources.
• Pitch Envelope This is the same modulation signal provided by the Pitch
Envelope. The Frequency Envelope and Amplitude Envelope can also be
selected as modulation sources.
• Random This provides a different modulation value every time you hit a key.
Example: With vintage analog synth patches, use pitch as the destination and
apply a very slight amount of random modulation. Each note will have a slightly
different pitch, which simulates the natural tuning instability of analog circuits.
• Trigrate This is a Trigger Rate Follower, which monitors how fast notes are
being played on the keyboard. For example, if routed to the Effect send of a
Program, you could automatically have more effect when playing slowly, and less
effect when playing quickly.
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