Apple Logic Express 7 - Manual (Page 98)

98 Chapter 17 ES1
Level Via Vel
The upper arrow works like a main volume control for the synthesizer. The greater the
distance from the lower arrow (indicated by the blue bars), the more the volume is
affected by incoming velocity messages. The lower arrow indicates the level when you
play pianissimo (velocity =1). You can adjust the modulation range and intensity
simultaneously by grabbing the bar and moving both arrows at once. Note that as you
do so, they retain their relative distance from one another.
Amplifier Envelope Selector
The AGateR, ADSR, and GateR switches define which of the ADSR envelope generator
controls have an effect on the amplifier envelope.
• AGateR activates the attack and release time controls, but allows the level to remain
constant between the time the peak level is reached, and the release of the key—
regardless of the decay and sustain settings.
• ADSR activates all controls for the amplifier section.
• GateR sets the attack time for the amplifier section to zero, with only the release
control still having an effect on the envelope level.
All ADSR parameters will always remain active for the filter (ADSR via Vel). A stands for
attack time, R for release time, while Gate is the name of a control signal used in analog
synthesizers, which tells an envelope generator that a key is pressed. As long as an
analog synth key is pressed, the gate signal maintains a constant voltage. Used as a
modulation source in the voltage controlled amplifier (instead of the envelope itself ), it
creates an organ type envelope without any attack, decay or release.
Glide
The Glide parameter defines the amount of (portamento) time applied to each
triggered note. The Glide trigger behavior depends on the value set in Voices (see
“Voices” on page 101). A value of 0 disables the Glide function.
LFO Waveform
The LFO offers several waveforms: triangle, ascending and descending sawtooth,
square wave, sample & hold (random), and a lagged, smoothly changing random wave.