I am approaching to a new low budget film project, I' ll have to edit dialogue and mix as well, there are many scene's very noisy, I splitted tracks, placed correctly room tones, smoothed the transition,etc etc, ( applyed many john purcell advises) now need to reduce the overall noise from the whole scene, how to do that? routing the tracks on an aux track with denoiser inserted to it? or via audiosuite and working on region by region, what is the correct workflow?
and: whats is intented for sidechain aux? often I read this in many sound design threads but I in my experince sidechain workflow is about for ex, to drive a compressor applyed on a kickdrum with bass guitar feeding it, probably I am confused because of translating limits,
anyway, any advice about correct workflow is welcome.

Not exactly sure what you're doing.. Is this hardware or software based? Are you sing the aux buss for a trigger for gates, comp., ect? Never heard of using an aux. buss with a broadband noise reduction plug-in. Normally broadband NR is not applied uniformly unless the track/clips are exactly the same. Typically each different one would need a 'it's own' noise print.

Rick , in this discussion, the general suggestion was to use eq on single tracks and on sidechain put any dynamic and nr plug in.

how to apply a denoiser on a noisy scene - Social Sound Design (http://socialsounddesign.com/questions/18677/how-to-apply-a-denoiser-on-a-noisy-scene)