Moog-music Slim Phatty User Manual download pdf (Page 11)

Page 12

Slim Phatty User’s Manual - The Components

Page 13

Slim Phatty 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 modulation is

applied, 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 simply 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 (hard synced) to Oscillator 1, forcing Oscillator 2 to restart its wave-

form from the beginning each time Oscillator 1 starts a new wave-

form 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 applied, the effect can be aggressive or warm and vocal.

Frequency:

Oscillator 2 has a switch labeled 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 fth). 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. 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 back 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 congure this.

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Moog-music Slim Phatty User Manual Page 11

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