Function
VCO
The VCO is a voltage-controlled oscillator that can generate either square-wave or
sawtooth waveforms. Choose the waveform with the WAVE switch.
An additional sub-oscillator can be added to this waveform with the MIX control. It
generates a square wave with a pulse width of 50%, but one octave lower.
n
n
n
n
n
MIX control to the left: only the sub-oscillator can be heard.
MIX control to the right: only the waveform selected using the WAVE switch can be
heard.
MIX control at the center: the square-wave/sawtooth and sub-oscillator are at the
same level.
The TUNE control changes the pitch of the VCO um +/-1 semitone. In the middle position,
the pitch matches that of the other MIDI instruments.
Pulse width modulation (PWM)
The pulse width of the square wave can be modulated using the envelope generator,
which also modulates the cutoff frequency. The ENV PWM control sets the intensity of
the modulation. In the left-hand position, the pulse width is a constant 50%. From a
certain intensity (PWM = 100%), the square wave and sub-oscillator cut off and are no
longer audible when the envelope is triggered. The duration of the pulse width modulation
depends on the decay time (DECAY control) of the envelope. An interesting sound results
when the sub-oscillator cuts off and is mixed with the sawtooth wave (the sawtooth wave
is not affected by the pulse width modulation).
Autoslide
ON: slides (a smooth transition from one pitch to another) are automatically triggered
when more than one note is played at the same time on the MB33II. The envelope
generator is not triggered in this case.
OFF: slides are permanently disabled. The envelope generator is triggered for each
new note.
SINE MB 33 II (English)
9
