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Architecture
At first glance, SP2 has a conventional subtractive synthesizer structure
with an oscillator producing a harmonic-rich waveform (PULSE) fed
thru a filter that takes away some of the harmonics to shape the timbre
and finally an envelope that controls the loudness of the output thru
a VCA (voltage controlled amplifier).
OSCILATOR
FILTER
ENVELOPE (VCA)
OUT
PITCH
TIMBRE
LOUDNESS
The deeper you delve into the SP2 architecture, the more clearly you will
see the internal routing; and by fiddling with the MOD faders, you will
uncover an unconventional synth-creature with unique behaviors. This
architecture, including internal routings and normalizations, is illustrated
on the front-facing side panel.
The envelope is normalized to the CUTOFF MOD, so you can use it to
control the timbre of the filter by bringing up the CUTOFF MOD fader.
The envelope also triggers the Sample & Hold circuit that generates
pseudo-random voltages that can be used to control the pitch of the
oscillator via the PITCH MOD fader. Therefore, each time you trigger the
envelope (either by pressing the TRIG button, cycling it with the CYCLE
switch, or triggering it from the sequencer), it will trigger the Sample &
Hold and can add randomness to the melody. The more you push the
PITCH MOD fader up, the more pronounced the effect will be.
We suggest you get to know the behaviors and interactions described
above before engaging the sequencer. There is a lot to explore!
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