Turn the multi-drive & feedback up while keeping the oscillator volume down. It seems counter intuitive but it works for me. Great synth…
Agree 1000%…There are so many textures/tones to be had by just using the mixer volumes combined with the Multi-drive & Feedback. It’s like having a pedal board and amp to tweak. Who needs a filter? 
I like using Osc 2 as the sub sometimes because the triangle waveform has some serious girth down there. It just adds the perfect amount of smooth low end to complement the sound. I do wish it had a Sine Wave though. You can create one with the self oscillating filter but that ties up too many parameters just to get a sine wave. Great for sine leads though.