I cover all the reasons "why" you would use two filters, instead of just one.
One example that I didn't see in the tutorial uses two filters to create a steeper filter (two LP 36dB/oct. filters in Dual mode to build a 72dB /oct. LPF). To be fair, it is described in the User Manual.
I'm curious to hear, how often do you synth heads out there use two filters? And how do you use them in your patch designs?
I use both filters the majority of the time, but it really depends on the preset. Simple patches or classic emulations don't demand that. In line with your filter mixing sections, stereo user oscillators benefit from the filter bussing structure. Like the 6 oscillators, detuning, and extensive oscillator routing scheme wasn't enough ...