[korg]
[ms50 title]

[owners manual]

3. The modules and their functions  ^

(6) MODULATION GENERATOR (MG)


- modulation generator

[one] FREQUENCY
Adjusts the "speed" of the cyclic signal (its frequency). With this knob you can vary the frequency from 0.1Hz to 25Hz; FM modulation will extend the range to 0.01Hz ~ 200Hz.
[two] PW/PWM (pulse width/pulse width modulation)
When there is no PWM input, this knob simply adjusts the pulse width of the output waveform from [pulse width 25%] to [pulse width 75%]. In this case, the voltage stays at +5V when the knob is turned all the way to [pulse width 25%], and at 0V when turned all the way to [pulse width 75%]. In other words, the pulse width becomes so narrow that it actually disappears and can no longer be heard. So check with the volt meter when you check pulse width. When using a PWM input, this same knob adjusts the intensity of (sensitivity to) pulse width modulation.
[three] FREQUENCY MODULATION INTENSITY (FM)
Adjusts the degree of modulation of the MG output by an external control voltage. At maximum intensity (sensitivity), 1V gives a 1-octave change.
[four] FM INPUT
For the external control voltage used to modulate the MG output signal frequency.
[five] PWM INPUT
For the external control voltage used to modulate the pulse width of the [mg pulse] output.
[six] [seven] [eight] [nine] MG SIGNAL OUTPUT
Use the waveform you need for the effect you want. Outputs [mg outputs] have amplitudes of 5Vp-p, so their voltage range is from -2.5V to +2.5V. The [mg pulse] output has a range of 0V ~ +5V so that it can be used as a trigger signal for the EG, S/H, and DIV. This pulse output can be connected directly to the EG trigger signal input jack to get repeat effects, or directly to the S/H trigger input for remote control of clock speed.

Low frequency oscillators (LFO's) are designed to be used for repetitive, cyclic effects like conventional vibrato. Such modules have only a few output waveforms and when used alone they do not provide remote control capability for frequency modulation (FM), pulse width modulation (PWM), or the like. In contrast, the MS-50's MG modules is capable of all the same functions as the VCO. Therefore, when you need a control signal to vary the speed of a rotating speaker effect, or something equally complicated, you can use this MG in combination with other modules for a very realistic effect.

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