Oscillator Section
Oscillators form the base of every synthesized sound. They o!er di!erent
waveform shapes to create various audio spectra. Each PerFourMer MKII
voice o!ers a voltage controlled analogue oscillator (VCO), four VCOs in
total. Every VCO generates sine, triangle, square and saw tooth waveforms
with octave positions 32’, 16’, 8’ and 4’. Alternatively, white noise or an
external audio input can be selected for each synthesizer channel.
The following controls are available:
Picture 1: The oscillator section
WAVE
selects the waveform shape for the VCO. Available are: sine ( ), triangle
(
), square ( ), saw tooth ( ) or noise ( ). With EXT selected, the
oscillator signal is replaced by the audio signal fed into the EXT IN/VCO
OUT input (see "Connections of the Synthesizer Channels", page 21).
NOTE The pulse width of the square waveform does not
have a dedicated control. However, it can be varied
using the modulation wheel (MIDI CC #1). This func-
tion can be enabled/disabled using EDIT PARAMETER
2: MODULATION WHEEL (PWM). (see "Edit-Mode",
page 29).
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