XERXES INSTRUCTION MANUAL
REV 0.7
Page
5
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21
OSC x PAM
Pulse Amplitude Modulation (PAM) is a unique feature to the Xerxes synthesizer. The
pulse amplitude (height) of the current oscillator is modulated by the waveform
amplitude of the other oscillator. If this button is pressed, Pulse waveform is
automatically selected.
PAM can “clean up” a waveform, making it
more defined at
the upper frequency ranges, and giving it more pronounced low frequency content at
lower ranges depending on the frequency and waveform settings on the other
oscillator. In this modulation setting the pulse width can still be adjusted using the
Pulse Width knob, and PWM can also be used at the same time to produce very rich
textures of sound.
NOTE:
Turning on PAM for both oscillators at the same time is not recommended. It
will generally produce silence from both oscillators, or if there is any sound, the
volume from each voice card may not be consistent. There may be sound present on
lower frequency range only where it can produce some interesting sound effects.
RING MOD.
Selects Ring Modulation, which inverts the waveform of the current oscillator with the
amplitude of the other oscillator. This is especially useful when used in combination
with the Oscillator 2 Sync and Glide functions where it can generate sounds with
harsh overtones that vary over time, such as metallic, laser, and bell-like sounds.
OSC 1
PULSE
OSC 2 PWM
OSC 2
SAWTOOTH
1 OCTAVE HIGHER
OSCILLATOR 1 PULSE WIDTH
MODULATED BY OSCILLATOR 2 AMPLITUDE
OSC 1
PULSE
OSC 2 PAM
OSC 2
SAWTOOTH
2 OCTAVES HIGHER
OSCILLATOR 1 PULSE AMPLITUDE
MODULATED BY OSCILLATOR 2 AMPLITUDE
