A Balance/Blend circuit uses a stacked centre-detent pot, essentially two opposite pots in one unit. Both halves (A and B) are on full in the middle, turn it one way and A stays full while B reduces, turn the other way and B is full while A reduces. This allows you to balance the sound/volume from two pickups.
What Corsair is asking about is a blender circuit, where a standard volume pot connects a pickup into the circuit allowing you to 'blend in' as much or as little as you like from that pickup. Doing it on a Strat allows bridge plus neck Tele combos, or blends it with the middle, or all thee pups. Here's a layout that uses a push/pull to swap the neck tone to a neck blender:
When the push/pull is down it acts as a normal tone for the neck, but pull it up and it swaps to being a blender for the neck. Then you can have bridge + neck, bridge + middle + neck, middle with a touch of neck etc.
There are different layouts you can use, depending on what you want. One option is a master volume, master tone and a permanent blender pot, or something similar, which sounds like what Corsair is wanting. A 'No Load' pot allows a permanent blender to be taken out of the circuit without needing a switch, turning it all the way essentially disconnects it.
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