The Tascam 688 is an amazing machine, by the way, and I've never been disappointed with any Tascam product. But I digress. The 688 has four effects loops, and in-line effects for each channel. On rare occasions, I'll ping-pong backing vocals among the six tracks, but I like to keep that sort of shit down to a minimum. Horn sections are almost always recorded with a large reverb.
Snare drums with gated reverb, blah blah blah.
The usual crap. The 688 also has a sweepable pseudo-parametric EQ on ten of its inputs, which makes an amazing difference in dense mixes. I usually use this sparingly on just about every channel, to help place each voice into a unique part of the frequency spectrum. Typically, there will be a lead vocal recorded in stereo. I like to run a dry signal to one side of the mix, and use a wee bit of digital delay on the other side.