PS-3300 includes two low-frequency oscillators (aka, LFOs) that generate signals intended for modulation purposes. Korg refers to these as "Modulation Generator 1" and "Mod Generator 2," and neither should not be confused with Generation X, which was the mediocre punk band Billy Idol fronted before he was, y'know, Billy Idol.
This the more full-featured of the two mod generators, and though it looks pretty unique, it should be familiar if you've used LFO's on other analog synths.
Waveform- This actually isn't labeled, but obviously, it's the large knob in the center. Wave choices include triangle, Saw I (standard saw), Saw II (ramp), rectangle (square), pink noise, and white noise.
Frequency- The Frequency knob sets the speed of the LFO, from 0.07 to 4000 Hz (with Sync switch off) or from 8 beats up to 1/64th note triplets (Sync switch on). Unlike typical LFOs that operate in the sub-audio range (i.e. beneath the human hearing spectrum), Mod Gen 1 goes up to 4000 Hz, which is well into audible range. This enables all manner of clangorous modulation when applied to oscillator, filter, and amp signals. The LED beside it flashes at the current modulation frequency, and if you look close, you'll notice that it's pattern matches the currently selected waveform.
Pink Noise and White Noise waveforms are not affected by the Frequency control.
Sync- When the Sync switch is in the down posish, Mod Generator 1 speed will lock to host tempo when using PS-3300 within DAW software, or to the current tempo in the top menu bar when using the standalone version.
Mod Generator 1 CV Jacks
Out jack- This is the bipolar output of the Mod Generator 1, allowing routing to any of PS-3300's mod inputs - it can be routed to any of the panels. Plugging a cable in has no affect on any of the hardwired MG1 knob routings; they'll all still work as normal.
The Ext Attack Control and Ext Release Control jacks affect the envelope generator, please see Envelope Mod section.
Ext MG1 Level Control jack- This allows a CV to control Mod Generator 1 depth. This is a unipolar input - it accepts CV's from 0-5V, with 0V being off, and 5V being full scale mod.
The most typical application would be to patch a cable from the master section keyboard Mod Wheel out jack for standard mod wheel vibrato (when MG1 Intensity control is dialed up). Here's what that would look like:
Ext MG1 Freq Control jack- Allows a CV to control Mod Generator 1's frequency. This is a bipolar input that accepts CV's from -5V to +5V; negative CV's will decrease mod rate and positive CV's will increase mod rate.
Mod Generator 2
Mod Generator 2 is more basic, with just a triangle wave. It's most useful for oscillator freq mod (vibrato), filter mod ("wah wah"), or mod of the Resonators section.
Frequency- The Frequency knob sets the speed of the LFO, from 0.2 to 12 Hz (with Sync switch off) or from 8 beats up to 1/64th note triplets (Sync switch on). The LED beside it flashes at the current modulation frequency.
Sync- When the Sync switch is in the down position, Mod Generator 2 speed will lock to host tempo when using PS-3300 within DAW software, or to the current tempo in the top menu bar when using the standalone version.
Mod Generator 2 CV Jacks
Out jack- This is the bipolar output of the Mod Generator 2, allowing routing to any of PS-3300's mod inputs - it can be routed to any of the panels.
The Ext Resonator Peak Freq Control jacks affects the Resonators section controls, please see Resonators section.