Xmod; O2-Filter; O3-O2; O3-Pw1,2 - Roland SE-02 User Manual

XMOD

The XMOD section is were you select how cross modulation will be applied. Cross Modulation is described as
XMOD (the X is a cross, and MOD is short for modulation) and also frequency modulation. Frequency
modulation is a vital component to analog sound design, and voltage control. It's easy to turn any cross
modulation knob and conclude that it's a sort of crazy freak-out. But in measured and intentional amounts,
XMOD can turn a simple pulse wave into a metallic ping, or a taught drum skin.

O2-FILTER

The O2-FILTER knob allows OSC 2 to modulate the cutoff frequency of the filter. This means that when you
rotate the O2-FILTER knob, the frequency of the filter for the SE-02 will begin to modulate to the wave shape of
OSC 2.
Experiment: Turn down the volume of OSC 2 and 3. Lower the filter to create a deep, moody sound. Set the
Waveform of OSC 2 to sine, and set the range to LO. Turn the O2-FILTER knob and listen to the wave shape of
OSC 2 begin to modulate the filter frequency.

O3-O2

The O3-FILTER knob allows OSC 3 to modulate the waveform of OSC 2. This means that the waveform of
OSC 2 is changed by the waveform of OSC 3 and this makes for some crazy audio hooliganism. If the filter can
be modulated by OSC 2, and the shape of OSC 2 can modulate the waveform of OSC 2 then the ramifications
of this, and the impact on the sound can be very exciting.

O3-PW1,2

The O3-PW 1 and 2 knob allows OSC 3 to modulate the pulse width of OSC 1 and OSC 2. In essence this is
how PWM (pulse width modulation) is achieved in the SE-02. PWM is a wonderful way to animate the width of
the pulse waveform. If you haven't set the waveform of oscillator 1 or 2 to PULSE/SQUARE then this won't
have any effect on the output.
Experiment: Set OSC 1 to make a SQUARE wave. Turn off the other sounds. Play a few notes and adjust the
filter and envelope to make a sound you really like. Set OSC 3 to LO range, and a rising SAW waveform. Now
slowly increase the level of O3-PW knob and listen to what happens to the texture of the sound. Do you hear a
difference? Go further and turn up OSC 2 and set it to a SQUARE waveform, and tune it to very close to unison
with OSC 1, but not quite. Now rotate the O3-PW knob again and listen to the pulse width begin to modulate to
the wave shape of OSC 3. Pretty cool, right?
Page 12 of 35 Manual V1.03 for firmware V1.11