Erica Synths SYNTRX II, User Manual

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OSCILLATOR 3 is primarily a low-frequency oscillator that goes into the audio
range and without an external CV applied, it generates pulse and triangle waves at
frequencies from 0.05 Hz to 500 Hz, adjustable by the TUNE knob. Both waves
have independent points on the patch matrix with an adjustable LEVEL for each
wave and both waves have manually adjustable SHAPE. Depending on FREE/KEY
FOL switch position, Oscillator 3 can be either free-running or controlled via
external CV (key follow). On the patch matrix, the pulse output shares the input
with the Sample&Hold output – use the switch on the Sample&Hold module to
select the output which is routed to the matrix.
The SYNTRX II has a Zener diode-based NOISE GENERATOR that provides full
spectrum white noise. The Noise Generator is not voltage controlled, but the
COLOUR knob allows for emphasizing low (LOW setting) or high (HIGH setting)
frequencies of the noise spectrum.
The LEVEL knob adjusts the amplitude of noise before it is sent to the matrix mixer.
The FILTER is a resonant multimode filter of unique design. Highpass and lowpass
filters in series allow for designing various filter responses. With the LPF (lowpass
filter cutoff) knob set to 10, the lowpass filter is all the way open and the filter
becomes a highpass filter with the HPF knob controlling its cutoff frequency. With
the HPF (highpass filter cutoff) knob set to 0, the highpass filter is all the way open
and the filter becomes a lowpass filter with the LPF knob controlling its frequency.
Any other HPF and LPF knob positions will make a bandpass filter with adjustable
bandwidth and center frequency.
If control voltage is applied to the Filter Frequency input on the matrix, the HPF/LPF
SWITCH determines which filter cutoff frequency is altered. In the middle setting,
the cutoff of both filters is controlled via incoming CV. This also means that the
center frequency of the bandpass filter is altered. In the HPF setting, only the
highpass filter cutoff is altered and in the LPF setting, only the lowpass filter cutoff
is altered. Incoming CV is added to the HPF and LPF knob settings. The filter can
be modulated at audio rate and when RESONANCE is set to 7 or more, it
becomes an oscillator that produces a pure sinewave.
The LEVEL knob adjusts the amplitude of the audio signal from the filter before it is
sent to the patch matrix.
OSCILLATOR 3
FILTER
NOISE GENERATOR
NOISE
LEVEL NOISE TONE
FILTER
HPF LPF LEVEL RESONANCE
LPF
HPF
OSCILLATOR 3
TUNE SHAPE LEVEL LEVEL
KEY FOL
FREE
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