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VCA – Voltage-Controlled Amplifier
The DRONE/ENV switch allows you to quickly dial in a VCA that will
change the loudness of the output signal based on the state of the
envelope. That means it will be silent until the envelope is triggered or
cycled. Furthermore, the loudness of the VCA can be controlled via the
ACCENT input.
Sample & Hold
Sample & Hold is a classic analog synth circuit that is used to provide
stepped random modulation voltages. The Sample & Hold on the SP2 is
inspired by this classic circuit but uses a clever feedback trick to provide
a lot more than just random steps.
The input of the S&H, aka the voltage it is sampling, is the TRI output of
the oscillator.
The Sample & Hold circuit waits for a trigger at the SAMPLE input. At
that moment, it freezes the value of the TRI signal and holds it as a static
voltage at the HOLD output until a new trigger is detected.
If the rate of the input oscillator is much faster than the SAMPLE rate
(which is the most common configuration), the HOLD output will be
random (left image). If the trigger rate is much faster than the oscillator,
then the HOLD output will be a stepped wave (right image).
INPUT
OCS TRI
INPUT
TRIGGER
HOLD
OUT
And if the rates are very close to each other, you can uncover a wide
range of pseudo-random/ pseudo-repeating patterns to explore.
ENVELOPE / SAMPLE & HOLD / VCA SECTION
SAMPLE SAMPLE
SAMPLE
HOLD
HOLD
HOLD
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