There's a great tutorial which uses a square and a static pulse to make an amazing bass patch on minimoog. If you use the ladder filter you can get really close with the Pro 3, give it a try!
Hint: maximum filter contour on a minimoog = +80 filter env amt on the Pro 3. And his keyboard tracking is the equivalent of 64 KEY>LPF AMT. And don't forget to turn off resonance compensation...or do
Playing around with this idea has lead to some of the best bass patches I've ever made on any synth.
I feel like the ladder filter is especially conducive to static pulse waves because when it's overdriven it kinda makes the different wave shapes all sound more alike, especially when resonance is involved. So you can use the advantages of thinner pulse waves while maintaining some subtlety.