Future-retro XS Manuel d'utilisateur télécharger pdf (Page 22)

ANALOG CONTROLS

PULSE WIDTH MODULATION AMOUNT: The PWM control sets the amount of modulation that the

PW MOD source will have on Oscillator B’s square/pulse waveform. When this control is rotated fully

counter-clockwise, no modulation of the square/pulse wave will occur producing a true square wave. As

you rotate this control clockwise, the affect of modulation will increase, causing the square wave to

narrow its pulse width duration.

All of the modulation sources pre-wired in the PW MOD control will have a range of 0 to +10 volts.

This allows these sources to vary the pulse width duration from 50% duty cycle to 3% duty cycle.

When the modulation source is 0 volts a true square wave will be produced. As the modulation source

voltage becomes more positive (up to +10 volts) the pulse width duration will decrease. The exception

here is that an external modulation source that goes in the negative voltage range could also be used,

causing this pulse width duration to increase its duty cycle. The useable range for these external

modulation sources would be –10 to +10 volts.

PULSE WIDTH MODULATION SOURCE: The PW MOD control selects which modulation source

will be used to alter the pulse width duration of Oscillator B’s square/pulse wave. A control voltage

source that varies its voltage over time can be used to animate the harmonic content of the square/pulse

waveform.

In the EXT position, any external control voltage connected to the OSC MOD input jack can be used to

modulate the pulse width. Keep in mind that the useful range for this external control voltage would be

–10 to +10 volts.

The LFO setting will route the internal LFO to modulate the pulse width duration.

The MOD W setting will route the mod wheel messages from a MIDI keyboard to modulate the pulse

width duration.

The MANUAL setting is an internal +10 volt stationary reference. When this is selected, the PWM

control is used to manually adjust the pulse width duration.

The VEL setting will route Velocity messages from a MIDI keyboard to modulate the pulse width

duration. The exception here is that if an external control voltage is inserted into the VEL IN jack, this

external control voltage will override Velocity messages received from the MIDI keyboard.

The ENVELOPE setting selects Envelope 1 to modulate the pulse width duration.

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Future-retro XS Manuel d'utilisateur Page 22