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3.2.5. Env Mod
The Env Mod knob adjusts the amount of envelope modulation applied to the filter cutoff by
the Decay knob and Accents.
3.2.6. Decay
This adjusts the Decay of only the filter envelope.
3.2.7. Accent
You actually accent a note either by checking a box for its step in the
via external
MIDI velocity
and the decay of the filter envelope becomes shorter, resulting a more pronounced fall-off.
The Accent knob determines the degree to which both of these things happen.
3.2.8. About the 303 envelope
The envelope generators in the original TB-303 are actually so simple that they can confuse
traditional synth players. There are two of them: one for volume and one for the filter, but
the Decay and Env Mod knobs as described above only affected the filter envelope. The
volume and filter envelope shapes were more or less simple gates, with no adjustable attack
or release phases. With most synth bass sounds, the character and emotion comes from
how fast the tone goes from being brighter to duller — more harmonics to fewer — or if
that motion occurs at all. So, given that the original 303 was meant to be an inexpensive
instrument, its manufacturer chose to focus envelope control on this "money shot" aspect of
the sound. Thus, what the accent knob is adjusting is really two things at once: the level of
the volume (VCA) envelope, and the decay time of the filter envelope.
Arturia - User Manual Acid V - MAIN CONTROLS
[p.82]. When a note is accented, two things happen: It gets louder,
sequencer [p.26]
or
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