9
FM Attenuverter:
The
FM Attenuverter
determines the depth of
frequency modulation applied to the cutoff/centre frequency.
•
Turning the knob clockwise will increase the depth of exponential
frequency modulation.
•
Turning the knob anticlockwise will increase the depth of
exponential frequency modulation with inverted polarity.
•
Centring the knob will attenuate the control voltage signal.
1V/Oct Input
: The
1V/Oct Input
is a bipolar control voltage input for
the cutoff/centre frequency.
•
This is a dedicated exponential frequency control input which
can be used for precise frequency modulation such as ‘keyboard
tracking’.
•
If
I-ō47
is self-oscillating, the
1V/Oct Input
can be used for
consistent pitch tracking of the sine waveform, effectively making
I-ō47
a quadrature sine waveform oscillator.
•
Control voltage is summed with the level set by the
Coarse
and
Fine
knobs.
Notch:
The
Notch
knob controls the centre frequency offset of the notch
response output. This parameter affects the
Notch Output
only.
The numbers surrounding the
Notch
knob depict a multiplier indicating
an approximate octave offset from the centre frequency.
•
¼ = 0.25 x centre frequency (-2 octave offset). [towards high
pass response]
•
½ = 0.5 x centre frequency (-1 octave offset). [towards high
pass response]
•
1 = centre frequency (0 octave offset). When the knob is set to 1, the
Notch Output
is a traditional symmetrical notch filter.
•
2 = 2 x centre frequency (+1 octaves offset). [towards low
pass response]
•
4 = 4 x centre frequency (+2 octave offset). [towards low
pass response]