I hope one of you is gonna let the Rematrix people know/link to this thread so they can do a fix.  

One strange Sonar thing I noticed, once I had the animation on the track I deleted the ReMatrix plugin, but the animation line stayed on the track.  It was visible in the trackview, but I couldn't select it or delete it.  That seems like a Sonar bug.  I looked but couldn't find any way to remove that left over track animation on something that no longer existed.
 

REmatrix is a bit buggy w/ automation - I've tried the same thing w/ wet automation.  I just use a buss these days.

Vastman
I hope one of you is gonna let the Rematrix people know/link to this thread so they can do a fix.  

I filled out their super tiny tech support form with a link to this thread.

msorrels
One strange Sonar thing I noticed, once I had the animation on the track I deleted the ReMatrix plugin, but the animation line stayed on the track.  It was visible in the trackview, but I couldn't select it or delete it.  That seems like a Sonar bug.  I looked but couldn't find any way to remove that left over track animation on something that no longer existed.
 

If you hover over what is now a ghosted envelope it should read "orphaned" but you should still be able to shift-click it and delete it.
It works with all other envelopes

Bristol_Jonesey
If you hover over what is now a ghosted envelope it should read "orphaned" but you should still be able to shift-click it and delete it.
It works with all other envelopes

That works.  I would have never imagine holding the shift key would let you select something that is disconnected  like that though.  The "orphaned" tooltip doesn't show unless you hold shift.  This does give you a way to reassign the automation to something else, so it's a feature I guess.  Still seems to me like it should clean up automation when the thing being automated is deleted though.

Holding down the Shift key allows you to select any envelope when you are not working explicitly with envelopes in Track View, as set by the Edit Filter

Just a quick addition, I've been playing with this a bit and I got exports/bounces to work by disabling fast bounce. Looks like ReMatrix doesn't like fast bounce when automating. 
 
Dean

Razorwit - FTW!!!
 
That worked for me as well, thank you.
Perhaps this will help others and maybe even help isolate the problem for our friends at Overloud.
My bassist will be pleased when he hears this mix!
 
Cheers, Dave

Overloud sent me a note this morning saying they had reproduced this hang when using a fast bounce and would have an update out for it shortly.  I just checked their web site and they now have version 1.1.12 up.  The test I did with a simple wav file and an animated wet no longer hangs when doing a fast bounce with 1.1.12.  I'd recommend upgrading.
 
From the change log

1.1.11 -> 1.1.12
----------------

- Fixed an issue that prevented successful completion of offline/non-realtime bounce/export in some hosts