Sorry, been a bit busy - finally getting some live audio production work happening down here in Oz... Much of what has been said is reasonably accurate to some degree. 1. OMF should always be used as a last resort IMO 2. An OMF can/may contain clip volume keyframes and / or clip pan keyframes but rarely both and if it does the destination DAW may or may not be able to decipher it. The net result is that it may as well not contain either. 3. I have seen OMFs from Premiere which fall into the above category. 4. Audition's OMF doesn't contain clip gain or track volume automation but it will contain clip volume keyframes. It will also create left and right tracks if you have mono media on a stereo track - so be careful with that one as it will double the size. 5. It is said that AAF is better - this is true but it is a little like saying that standing in one pile of crap is better than standing in two.  OMF is an unnecessarily complicated piece of work. AAF takes that and goes pro. 6. An AAF can contain so much more detail.  In fact so much so that it is literally mind boggling - I mean literally mind boggling. This is especially true for Media Composer AAFs - they can contain FX settings and more - it takes several pages of xml code just to indicate that a clip is muted so you can see how a million lines of xml is not uncommon.  What is common is that very few other DAWs except for ProTools (another Avid product) can decipher these secret internal handshakes. 7. An AAF can contain heaps of detail but it is rare for many other DAWs to read all that detail if it can read it at all. For example - get 2 clips, xfade them in Logic and export an AAF then open it in ProTools and it won't look the same - it won't even look the same if you reopen it in Logic.   I could go on and on and on (if I haven't already) but back to the OPs issue 1. "When exporting an OMF from Premiere and importing it into Audition or ProTools it appears that the clips lose their effects and gain settings. Is there any way to keep those?" No, kiss your FX goodbye Gain settings should be saved if you use clip volume keyframes 2. "What's the best way to retain fidelity when sending audio for a mix (assuming this could go to Audition or ProTools, I have no say over what they use)?" You have two options:- 1. Send wet and dry 24bit stems Of course if you screw up any xfades, fades and other things it is hard to come back but on the other hand you have your fx burnt into a copy of the stems - of course they can't be unburnt but you also have the dry stems. 2. Buy a copy of AATranslator (yes I have no shame) it will convert your Premiere project, OMF, AAF, Audition sesx or whatever to whatever (which includes a ProTools PTX, Audition sesx, etc, etc)  The best solution really depends on what your real needs are - maybe start with stems and go from there?   ... View more

Make sure your audio interface is set to the same sample rate as your session so that Audition is not resampling on the fly ... View more