Future Retro XS - Manual (Page 27)

ANALOG CONTROLS
The A ENV setting lets Envelope 1 control the amplitude of Oscillator A’s waveform, as determined by
the WAVE A control setting, to modulate Oscillator B’s frequency. This provides a more traditional
form of FM where the modulation source varies its amplitude over time.
The B ENV 1 control sets the amount of pitch sweep that Envelope 1 will have on Oscillator B’s
frequency. When this control is rotated fully counter-clockwise, no pitch sweep will occur. As you rotate
this control clockwise, the amount of pitch sweep will increase. Since Envelope 1 has a range of
0 to +10 volts, this will cause Oscillator B’s frequency to rise above the normal frequency for a note’s
pitch.
MIXER
The XS provides a three-channel audio mixer for combining different audio sources that will be routed
to the input of the filter section. In addition to summing these audio signals going to the filter, the mixer
also allows you to overdrive the input of the filter section. Notice how the tick marks around the mixer
controls become increasingly thicker in appearance. This is to indicate where overdriving the filter input
will occur. If you are using a single audio source routed to the filter, you will typically want to set the
mixer level somewhere between the middle tick mark to two ticks to the right of the middle position to
provide the best signal-to-noise ratio and to maintain full resonance response in the filter. As you add
more audio sources to the mix you may need to decrease each part’s level to maintain full resonance
response in the filter. The harder you drive the input of the filter, the less noticeable effect filter
resonance will have.
LEVEL A: This control determines the amount of signal selected by the WAVE A control to be sent to
the filter.
LEVEL B: This control determines the amount of signal selected by the WAVE B control to be sent to
the filter.
LEVEL C: This control determines the amount of signal selected by the WAVE C control to be sent to
the filter.
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