Quadrax can be made even more potent by pairing it with a Maths AND the Qx expander. The Qx allows you to do things like "cascading" different LFO waveforms based on the four pairs of rise/fall settings on the Quadrax, and this plays really nicely with the Maths's ability to screw around with these sorts of signals on its own. And +1 on the Doepfer ADSRs...in fact, the A-140-2 is the exact thing you want: two ADSRs in 8 hp.