User Manual

Table Of Contents

An envelope generator creates a control voltage that changes in value over time. Subharmonicon

contains two envelope generators, each with an Attack stage and a Decay stage. The ﬁrst EG adds

control to the Cuto Frequency of the VCF, or ﬁlter; the second EG adds control to the output level

of the VCA.

VCF EG

The VCF EG produces a time-variant control voltage that modulates the setting of the

VCF Cuto Frequency.

VCF ATTACK

The VCF ATTACK knob determines how much time is required for the Attack

stage of the VCF EG to rise (or fall) from the level speciﬁed by the CUTOFF

knob to the maximum Cuto Frequency achieved using the VCF EG AMT knob,

with a range of 1 millisecond to 10 seconds. Once a trigger or gate is received

by Subharmonicon — either from the internal sequencer or from an external

keyboard, via MIDI, etc. — the VCF EG will begin its cycle.

NOTE: The Subharmonicon VCF EG is unique in that, while in the Attack phase, the VCF

EG will not restart even when a new trigger or gate is received. Only once the Attack

phase has been completed can a new trigger or gate be received to restart the VCF EG.

VCF DECAY

The VCF DECAY knob determines how much time is required for the Decay

stage of the VCF EG to fall or rise from the Cuto Frequency achieved using

the VCF EG AMT knob to the level speciﬁed by the CUTOFF knob, with a range

of 5 milliseconds to 10 seconds. When a trigger is received, the VCF EG will

complete the Attack stage, and then proceed to the Decay stage. When a gate

is received, the VCF will complete the Attack stage and hold at the maximum

level until the gate ends, at which point the Decay stage will begin.

VCF EG AMT

This knob controls the amount, or depth, of change to the Cuto Frequency

caused by the VCF EG. Also note that this knob is bi-directional, with both

positive (clockwise) and inverse (counter-clockwise) values. In the center

position, the VCF EG has no eect. Positive (+) values will cause the VCF EG

to open the ﬁlter on the Attack stage, and close the ﬁlter on the Decay stage.

Inverse (–) values will close the ﬁlter during the Attack stage, and open the

ﬁlter on the Release stage.

VCA EG

The VCA EG produces a time-variant control voltage that modulates the attack and decay of the

Volume level.

VCA ATTACK

The VCA ATTACK knob determines how much time is required for the Attack

stage of the VCA EG to rise from zero to the level speciﬁed by the VOLUME

knob, from 1 millisecond to 10 seconds. Once a trigger or gate is received

by Subharmonicon — either from the internal sequencer or from an external

keyboard, via MIDI, etc. — the VCA EG will begin its cycle.

NOTE: The Subharmonicon VCA EG is unique in that while in the Attack phase, the

VCA EG will not restart even when a new trigger or gate is received. Only after the Attack

phase has been completed can a new trigger, or gate, be received to restart the VCA EG.

THE ENVELOPE GENERATORS (EG)