CM100B
Revision 1.01
AP099
frequency will be less audible relative to the frequencies being resonated. As the setting is
increased beyond 7, the filter breaks into oscillation and will act as a sine-wave audio source
whose pitch is determined by the cutoff frequency.
Envelope Amount Knob
Sets amount (not the shape) of ADSR filter envelope CV controlling the filter cutoff frequency.
The filter envelope generator is discussed below.
Keyboard Amount Knob
Determines the amount of KYBD CV controlling the filter cutoff frequency. When set between
7 and 8, the filter cutoff frequency is maintained at a constant point relative to the notes
played on the keyboard, creating consistent tone. When set to 10, notes played higher on the
keyboard will have less of their overtones suppressed than those played on the lower end of
the keyboard. As a result, the higher notes will have a brighter timbre. When reduced or off,
notes played higher on the keyboard will have more of their overtones suppressed than
noted played lower. As a result the higher notes will have a duller timbre.
The filter envelope generator contours timbre by controlling the filter cutoff frequency. The
entire contour pattern is initiated when a key is struck, producing a GATE. The initial
appearance of the GATE "triggers" the envelope generators to proceed through their
ATTACK and DECAY periods. After the ATTACK and DECAY periods set for each envelope
generator have elapsed, it will produce a steady control voltage (CV) at the level set by the
SUSTAIN knob for as long as the GATE is present. When the key is released, the GATE goes
off and the envelope generator output voltage drops to zero at a rate set by the RELEASE
knob.
Attack Knob
Varies time for envelope to increase from zero to maximum, from 2 milliseconds to more than
6 seconds.
Decay Knob
Varies time for envelope to decrease from maximum to SUSTAIN level, from 2 milliseconds to
more than 6 seconds.
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