checkerboard.
easy example track 1 the sample/sound for say 5 bars.
track 2 the same 5 bar sample but it starts at the the project 4th bar.
back to track 1 and so forth repeat and rinse.
this is the method post production does for dialogue, foley bg etc where shit has to overlap without crossfades (especially when dealing with a hundred tracks of just for one scene).
also, do inline printing. save the mixdown within pt and than use the shortcut key to export the highlighted mix. not only do you get a near instant 'bounce' (really export) but you avoid pt screwing up the mix when doing the regular bounce to disk. it also allows you to come back within pt and allow you to reference the mix if it needs to be changed, even better if you've made stems or a bunch of mixes i.e. radio edit, dirty, tv mix, long version, bumper, tag, chorus, no chorus, etc all in one session (better yet save a new session as well with just the mixes)