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MODE
This switches internal routing between the analysis and synthesis filter banks.
Set to VOCODER, each of the analysis filter envelope follower outputs are
internally routed to control the level of its paired filter in the synthesis filter
bank (filter 1 ENV F is internally patched to filter 1 VCA CV, filter 2 ENV F is
internally patched to filter 2 VCA CV, etc.). In VOCODER mode, therefore, the
spectral shape of the PROGRAM signal controls the level of the filters in the
synthesis filter bank, shaping the frequency spectrum of the CARRIER.
Set to FILTER BANK, these internal routings are disconnected. The synthesis
filter band levels are controlled only by their respective level controls and VCA CV inputs and are
unaected by the envelope followers (which are still present at their respective ENV F outputs). This
way, the synthesis and analysis filter banks can be used completely independently.
The CARRIER section of Spectravox
generates a CARRIER signal which is
sent to the synthesis filter bank and then
sent to the VCA section and output. It
consists of a variable waveshape VCO, a
NOISE source, and CARRIER MIX.
VCO FREQ
This sets the frequency of Spectravox’s VCO—from low sub-audio frequencies
at a minimum to around 2 kHz at maximum.
VCO FREQ
FILTER BANDS (Continued)
VCO WAVE
This sets the waveshape of the VCO—either a sawtooth wave or a pulse wave.
CARRIER
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