In my quite compact home studio, my rackmount headphone amp works fine, however I'd like to put a more versatile setup together for location work. It looks like I'll have a big gig in the near future which will involve headphones widely distributed on a stage. I have an old stereo power amp I can use for the feed. I figure I'll make up a bunch of little boxes with (3) TRS jacks each and a pot for volume control. Two of the TRS jacks will be wired parallel (input/pass thru) and the third will be wired through the pot. I checked out a little Radio Shack headphone volume control - they use a 500 ohm audio taper pot wired up voltage divider style (hot to ground across the resistor - the tap goes to the output). Is this a reasonable design to follow? My thought is that I can feed one box and daisy-chain others with TRS patch cables. Off the top of my head, I don't know what kind of voltage a power amp will put out - thus I don't know if I need to be careful about the power rating on the 500 ohm pots, or if I should go with higher resistance to keep the power draw down. Any tips ?