GarageBand Digital Mono
The Digital Mono instrument is based on the ES2. This is a monophonic digital synthesizer lead sound.
Volume slider: Sets the overall volume level of the instrument.
Tuning slider: Sets the overall pitch of the instrument.
Harmonics slider: Makes the sound a little thicker (more) or thinner (less).
Timbre slider: Changes the color of the sound from dark to bright.
Timbre Envelope slider: Dynamically changes the color of the sound, depending on how firmly you strike your keyboard.
Low values have little or no effect on the color of the sound, no matter how hard you play the keys.
High values result in significant changes in the sound, in response to firmer or softer keyboard playing.
Decay slider: Makes the harmonic portion of the sound (bright) sustain for a longer time at slow values. Faster values move to the Sustain level more quickly.
Richness slider: Subtly detunes each played note from one another, making the sound a little thicker, particularly when high parameter values are used.
Distortion slider: Distorts the overall sound, making it quite nasty and aggressive.
Important: Take care with the Distortion parameter as it can significantly increase the overall volume of the instrument, which may result in damage to your speakers or ears!