Crumar bassman, User Manual

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Sub-oscillator OSC3 The only available waveform for this oscillator is the square
one, and the only available reference octave is 32’’. Even if OSC3 is defined a sub-
oscillator, it is very important for creating deep and warm sounds.
Controls of OSC3 are level and tuning: for modify these parameters , operate in
this way:
1) Level : press and release “RECORD” button , press “OCTAVE OSC1” for
decrease output level ( until 0 ) or “WAVEFORM OSC1” for increase output
level ( until 63).
2) Detuning : press and release “RECORD” button, press “OCTAVE OSC2” for
decrease tuning ( until 0) or “WAVEFORM OSC2” for increase tuning ( until
63). Interval is +/- 1 semitone, central position is value 36 ( C1). Also this
control, such as “INTERVAL OSC2” is always dependent from “TUNE
OSC1”.Please keep in mind to re-press “RECORD” after modifications of
level and tuning for avoiding the writing of USER memories or sequences.
THE FILTER - VCF
After mixing signals with controls “LEVEL OSC1, OSC2 e OSC3”
( and signals from “AUDIO IN” ) all is routed to the low-pass filter VCF with
24dB/octave action.
VCF filter has got 3 controls: “CUTOFF”, “EMPHASIS” & “CONTOUR”.
a) “CUTOFF” sets the filter working point..
b) “EMPHASIS” or resonance increases the amplitude of frequencies near the
cutoff and boosts them. This control allows the self-oscillation too: turn the
control on the right, the filter starts to self-oscillate with a sinoid wave. If
you want to couple cutoff frequency with “Bassman” notes, you have to set
the “keyboard Follow” to ON ( see system settings).
c) “CONTOUR” adjusts the cutoff modulation by envelope “ADSR1 ”.
AMPLIFIER - VCA
The last chain of the signal is the Voltage controlled Amplifier: its shape is defined
by
ADSR2.