Or you can step up and get the 18i20, which has five separate mixes available. But how do you get them out to the five sets of headphones (or one or two or three or four)? You buy used, cheap little mixers made by, say, Behringer. Each little mixer will cost maybe 60 bucks or so. Then you need cabling to hook everything up. Of course the 18i20 is around 500 or so (do NOT buy a used one), but you can expand from one mixer and one extra set of headphones to two, then three, then four . . . . That's one of the set ups I have at the remote recording space. Since I'm the "engineer" I control the individual mixes, but the person receiving the mix can tell me to turn up the guitar, or turn down the bass, or whatever, and you simply go to his or her mix and do that. The performer controls their own overall volume, and they can add a little bass or treble if they're feeling frisky. This is a relatively cheap way to get customized mixes to performers. Headphones? ATH-50's, around 120 or so apiece. I was able to build up all of these separate parts to where I now have the ability to get custom mixes out to performers. Sure those little mixers' headphone outs aren't the greatest, but it's for monitoring. Total cost, including the cables? Around two grand or so, but that amount is spread out over time after the initial 500 for the 18i20 and 250 for two sets of phones 60 for one cheapie mixer, and 80 or so for cables. I tried the headphone amp route, but the limitations can be off-putting, to say the least. If you're going to be doing this in any kind of serious way, you're going to wind up, eventually, needing phones and their mixes for more than two people. One of the great features of the Focusrite line is that custom mix app. Then there's the need, too, for a patchbay down the line . . . .