Fairly easy:
Since you understand the definition of unipolar vs. bipolar, try some simple experiments to see what it can do:
-Set up a simple sawtooh patch and put filter 1 cutoff in the middle (=64). Also add some resonace. Now go for the modulation matrix and let lfo 1 modulate the filter 1 cutoff bipolar. Keep it simple and predictable so set lfo 1 waveform to sine or triangle. Play and hold a note and now you should hear the filter open and close fully. That is: it moves filter cutoff from fully closed (0) to fully opened (128). Once you put the modulation in unipolar, the negative part of the lfo cycle is inverted and therefore also positive. Result: the filter doesn' t close anymore. Instead it moves from 64 to 128 twice in one cycle which allows for a different rhythmic structure.
-A practical, little more complicated example and walkthrough:
Start from an init patch and set the following parameters:
-set both oscillators to sinewave
-Set fm type to wave
-Raise oscillator 1 pitch with two octaves
-Set oscillator balance to 128, so you only hear the right oscillator.
-Set oscillator phase to 1
-Set detuning of oscillator 2 to 0 (=no detuning)
-Play a couple of low notes and twist a little with the env->fm amount. That parameter controls how much the filter envelope injects fm into oscillator 2.
-Experiment with env->fm amount, fm amount and the filter envelope parameters until you obtain a classic fm bass sound.
-Turn on the arpeggiator and configure the arp so that it generates a nice arp.
-Time for some modulation:
-Move into the modulation matrix and and let lfo 1 modulate env->fm amount or fm amount or both.
-Set lfo 1 to tempo synced and choose a speed that is rhythmic, for example 1/2, 1/4, 1/8 or something.
-experiment with different lfo waveforms, the shape parameter and unipolar vs. bipolar modulation.
Once you play and hold a few notes, the arp keeps repeating those notes and the tempo synced lfo injects various amounts of fm into the signal. Since the lfo is tempo synced, this should sound fairly rhythmic and changing from uni to bipolar gives different variations.
If you are still reading, enhance this patch a little further:
-set lfo 2 to a tempo of 1/6 or 1/3 or something like that.
-in the modulation matrix let lfo 2 modulate the depth of modulation of lfo 1. You do that by selecting the correct slot destination.
Now lfo 1 directly modulates fm amount, but at the same time lfo 2 controls how much lfo 1 affects the signal. Since lfo 2 and lfo 1 have different speeds, you have two "rhythms" in one signal. Again create variations by changing uni and bipolar modulation, tempo, lfo waveforms, shapes, etc...
A final further enhancement to top it off:
-Let lfo 1 modulate lfo 2 depth. Meaning: lfo 1 modulates lfo 2 which modulates lfo 1 which modulates fm.
-Let lfo 2 or 1 or both modulate oscillator 1 pitch. This gives wild results with a lot of harmonics. If it gets too wild, use the filter to keep it under control.
-There happens to be a third lfo...
Greetz,
M.