like sintech said, 'triangle mode' leaves the console in mix, unless you press ready group/tape. i wouldn't also hit the master input flip, as that puts the whole console to mic input.
i always use this for overdubs or vocal sessions, where i'm not tracking everything from scratch.
you can have a mix going, and just press the ready group button on the channel you want to record on (plus input flip on that channel if you're using outboard pres).
than you automatically have small fader to tape, and the monitor path on the large fader.
actually using the small faders to mix used to be common practice for some on old SSLs, when the VCAs didn't sound as good. that defeats the purpose of an SSL though imo, as you lose the automation and some of the routing flexibility.