Future Retro XS - Manual (Page 24)

ANALOG CONTROLS
OSCILLATOR MODULATION
The oscillator modulation section is used to route internal and external modulation sources to modify the
frequency of Oscillators A and B. With these sources one can create numerous effects such as vibrato,
FM, cross-modulation, self-modulation, pitch sweeping, and more. When oscillators are modulated with
an audio range source, this FM effect can alter a waveforms harmonic content quite drastically for new
timbral possibilities.
OSCILLATOR A MODULATION
The A AMOUNT and A MOD SELECT controls are used to modulate the frequency of Oscillator A.
The A AMOUNT control sets the amount of modulation that the A MOD SELECT source will have on
Oscillator A’s frequency. When this control is rotated fully counter-clockwise, no modulation will
occur. As you rotate this control clockwise, the amount of modulation will increase.
The A MOD SELECT control selects which modulation source will be used to alter the frequency of
Oscillator A.
In the EXT position, any external control voltage connected to the OSC MOD input jack can be used to
modulate the frequency of Oscillator A. Keep in mind that positive control voltage will increase the
oscillator’s frequency, while negative control voltages will decrease the oscillator’s frequency.
The LFO setting will route the internal LFO to modulate Oscillator A. This LFO waveform will range
from –5 to +5 volts, causing Oscillator A’s frequency to rise about and fall below the normal frequency
for a note. You can use this to create vibrato-like effects.
The LFO MW setting lets the mod wheel messages from a MIDI keyboard control the amplitude of LFO
signal used to modulate Oscillator A’s frequency. In this way, one could record mod wheel messages
into a MIDI sequencer to animate the effect the LFO will have on Oscillator A’s frequency.
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