If you wanna play with the filter you use the Vocoder ocs as it doesn't produce any sound without input and then put resonance to full. Now you can set Cutoff to the cycling envelope for some sweet SFX that are similar like playing with the ms20 filter and it's waveshapable lfo. You can go from Saw over Triangle to Ramp.
Alternatively you can set they keytrack to 100 (key/arp to cutoff) and now you can even play the filter with the keyboard and you pretty much have a sine wave VCO, put some external distortion on that and you can even shape the wave to something more gritty.
