You just want to send the output of voice1 or voice2 to the looper, yes?
Is it ok if they're both 'active'? Is just routing the audio ok?
Routing cv and gate is harder.
With two Doepfer 182-2's, you need two cv/gate pairs, the trigger for each, and reset for each to sync them.
At least 8 wires vs. 2 wires if it's just audio. Plus 2x 4hp in the rack.
There are advantages though to routing cv/gate. Both voices can interplay,
and you can have long sustains without cutoffs or clicks when you switch, but it gets complicated quickly.
Look at the Doepfer A-133-2 Dual Voltage Controlled VCA/Polarizer/Inverter or the cheaper A-130-2 dual VCA.
It'll sound better.