Model 261e Complex Waveform Generator
261090804
The 261e consists of two separate oscillators. One, the modulation oscillator,
serves primarily to modulate the second, called the principal oscillator. We’ll
discuss the two oscillators separately.
Modulation Oscillator
The modulation oscillator has two ranges, one in the audio range of 27 to
7040 Hz; the other mostly in the sub-audio, ranging from .25 Hz to 64 Hz.
Pitches may be voltage controlled, with variable magnitude and direction.
With the multiply knobs set fully clockwise, stretch tuning may be applied as
desired (adjustment holes are below to the right of the main tuning knobs).
An F.M. input provides for frequency modulation.
Waveshape is voltage controllable, ranging from sine through square and
pulse; a multiplying input varies the degree and direction. Three modulation
targets can be chosen, singly or in any combination. Note that
pitch
modulation responds only to sinewaves.
Pitch tracking, when enabled, forces synchronicity with the principal oscillator.
With no control voltage applied to the modulation oscillator, its pitch will
precisely track that of the principal oscillator. The offset will be zero when the
modulation frequency is set to 440 Hz. (indicated by extinguishing the bicolor
LED).
A sync facility permits synchronization to MIDI note-on messages, or to
subdivisions of the principal oscillator. Hard sync truncates the waveform; soft
sync uses a phase locked loop to achieve synchronization.
Principal Oscillator
The principal oscillator generates a sine wave varying in frequency from 27 to
7040 Hz, which is then applied to three voltage-controlled timbre-shaping
elements. The
degree
of timbre is variable in offset, magnitude and direction.
Symmetry
and
order
have variable offset and are voltage controllable.
MIDI messages can be received by the 261e via 1 of 4 internal busses. Bus
I.D. for the module is set with two board mounted switches, and can be
displayed on the 225e by holding the remote enable switch closed for about
two seconds. The normal settings start at A and go for as many modules as
you have (up to D, or four).
Summary of Contents for 200e series
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