Moog Music Little Phatty Stage II - Manual (Page 10)

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LP Stage II User’s Manual - The Components
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LP Stage II User’s Manual - The Components
Waveform:
Each oscillator has a switch labeled WAVE that allows the analog edit control to modify the waveform.
The waveform is continuously variable from triangle, to sawtooth, to square, to rectangular. The waveform
is morphed gradually from one to another as the value control is rotated. The legend around the analog
edit control for the oscillator section indicates the knob positions to obtain the triangle, sawtooth, square
and skinniest pulse waveforms.
Because the waveform is voltage controlled, this parameter can be modu-
lated. This allows the generation of some very interesting timbral
changes. By limiting the modulation between the square and thin
rectangle (pulse) waves, you can get pulse width modulation, a classic
analog synthesizer sound. Although the waveforms can be set from
the front panel individually for each oscillator, modulation is applied
to both waveform controls simultaneously. When using modulation,
it is possible to make the width of the rectangular wave so skinny
that it becomes silent.
Sync:
In the center of the oscillator panel is a switch labeled 1–2 SYNC. This is an ON/OFF type switch that
has no interaction with the analog edit control. Sync is ON when the 1-2 SYNC switch is lit. With sync
on, Oscillator 2 is synchronized (synced) to Oscillator 1, forcing Oscillator 2 to restart its waveform from
the beginning each time Oscillator 1 starts a new waveform cycle.
The effect is noticeable if the synced Oscillator is a higher frequency
than the Reset Oscillator. The main frequency heard is that of the
reset oscillator. As the frequency of the synced oscillator is swept, it
reinforces the harmonics of the reset oscillator. Use the Oscillator
2 Frequency control to hear this effect. Depending on how it is ap-
plied, the effect can be aggressive or warm and vocal.
Frequency:
Oscillator 2 has a switch labeled OSC 2 FREQ that allows the analog edit control to adjust the frequency
of Oscillator 2 relative to Oscillator 1. The pitch of Oscillator 2 can be adjusted up or down 7 semitones
(± a fifth). By changing the pitch of Oscillator 2, more than one frequency can be played when a key is
pressed, creating intervals for large adjustments, or to get a chorus sound when the oscillators are just
slightly out of tune. Note that Oscillator 1 does not have a frequency control because it is designed to
serve as a reference oscillator
.
Glide Rate:
In the center of the oscillator panel is a switch labeled GLIDE RATE. When this is selected, the analog edit
control is used to set the glide rate (portamento) between notes. A Glide switch on the User Interface
panel (on the far left) turns the Glide effect on or off. Glide is the time it takes to go from one note to the
next. The glide rate can vary from virtually instantaneous to a very slow glide (about 5 seconds to go from
the lowest C to the highest C on the keyboard).
Additional CV control:
The PITCH jack on the side-panel is a CV input for external control of the oscillator pitch. This input
controls the frequencies of both oscillators. A 1-volt change of this voltage will change the pitch by
NOMINALLY one octave.
The jack accepts -5 to +5 volts, or an expression pedal like the EP-2.
PERFORMANCE TIP: A steady control voltage applied to the PITCH jack will offset the base
pitch of both oscillators. You can use this feature to transpose the keyboard to any desired
interval applying the appropriate steady-state CV. See Appendix J for more information on
how to configure this.