
Meet the SJ-2’s envelopes
The SJ-2 has two ADSR type envelopes, which can be scaled by velocity and key-tracking
Envelopes are triggered when a key is depressed; from this point the output of the envelope (used for
modulation) will develop over time in a predictable profile, defined by the user, using controls in the
envelope section. The configuration of these controls varies from one instrument to another, but a
popular standard which emerged early on is to have four controls - Attack, Decay, Sustain & Release.
The following graph shows how these four controls operate on the envelopes output:
ATTACK
DECAY
RELEASE
SUSTAIN
OUTPUT
TIME
holds this level
indefinitely,
until key is released
13 Programming -Envelopes
Key is released
Key is pressed
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