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Filter Operation (Resonance, Noise):
The 24 dB resonant filter is implemented as a ladder style filter. It is self
oscillating (when the resonance parameter is turned up high) and with
increasing drive, it exhibits (by design) a certain amount of tube style
distortion (even harmonics) which makes it a very musical filter.
Setting the mode selector to position
'CONTROL'
, filter drive (P1) and
filter resonance (P2) can be adjusted. The pitch of the internal oscillators
(Raw Oscillator Pitch) can be shifted up and down with knob P3. (Hint: set
this parameter (P3) to max (or middle) before setting up the pitch of the 3
internal oscillators / noise generators).
The
'RESONANCE'
position of the instrument selector has 3 raw
generators available: saw-tooth (P1), square (P2) and needle (P3). Each raw
generator can be independently adjusted in pitch and volume.
The
'NOISE'
position of the instrument selector has 3 noise generators
available: white noise (P1), noise (P2) and crackle (P3). Each noise
generator can be independently adjusted in volume. Noise (P2) and crackle
(P3) can be independently adjusted in pitch (kind of) as well.
The stereo inputs of the theremin are combined and added to the internal
audio generators and then send to the filter input. When not using the
internal audio generators (only external signal), both filter positions
('RESONANCE'
and 'NOISE') are essencially identical.
The resonant filter has 3 outputs: High-Pass (P1), Band Pass (P2) and Low-
Pass (P3). Each output can be panned left/right and adjusted in volume.
Setting the mode selector to position
'PAN'
allows you to adjust pan for
each output.: pan High-Pass (P1), pan Band Pass (P2) and pan Low-Pass
(P3).
Setting the mode selector to position
'TONE'
allows you mix the 3 filter
output levels as desired. Turning the level of HP (P1) and BP (P2) to zero
and having the level of LP (P3) all the way up, will operate the filter as a
Low-Pass filter (!) etc ...
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