Once again, thank you, and thank your friend.
 
It looks like XSI's documentation for the FRAW2 format is wildly inaccurate...  In the line right after Start_FCurve, the second number specifies the curve type.  In all of your examples, it is 20, or "Standard Fcurve: keys have 2 values and 2 tangents".  I was attempting to use type 30, "Raw fcurve: keys have 2 values but no tangents".  Because I was trying to specify a raw curve with no tangents, I was also trying to specify a key type of 1, "The key is continuous and has no tangent => it's a continuous raw key".  All of this is legal according to the documentation, but apparently is unsupported in the actual program.
 
I will make a new version that uses type 20 curves and type 0 keys and 0.0 tangents and get that to you today.  I'll also split out the fcurves into the separate files and remove some of the redundant quiet keys.
 
Thanks again!
Mac

Thank you for the link.  I had found that earlier and got quite excited , but several of their plugins are fairly out of date, so I'm not sure how far that will take me.  
 
I apologize for my slow response times and current lack of progress -- other things are really busy right now, and I'm pretty much looking at 12+ hour workdays without counting any TAFA development.  I'd much rather be working on TAFA, but unfortunately the other things pay the bills, so they take priority.
 
I'm glad that the Magpie scripts provide a way to use the "simple text" format from TAFA and get it into various systems.  I don't want that to be the limit of integration either, but at least it gives a way for people to get on with their work today.  Thanks for letting us know about that.
 
I'm hoping that around the first week of December I can start putting some meaningful time back into TAFA.  I'm WAAAAAAAY behind any schedules I've ever stated for TAFA development...  
 
Back to the other stuff  
Mac

Hmmm...  Did TAFA and the MP scripts come into play anywhere in this process, or did you just export a dotXSI and then reload it?
 
If you just saved and reloaded, it is somewhat disturbing that you went from 2 blend shapes to 100 (or possibly 101) blend shapes...
 
Regardless, thank you for the test file and description of relevant information.  That will help my dotXSI experimentation a lot.
Mac

Marc,
 
We're long time users of TAFA, and used it with lightwave to complete a few dozen projects in the past.  We've moved over to XSI now, and we're anxious to see some support for XSI in TAFA.
 
I see here in the forums that xsi users are exporting to LWO with endomorphs... how is this possible?  Using what plugin?  We're using XSI version 5.1, and only see lightwave support in the now included Point Oven export options.
 
Looking forward to some action on the XSI front!
 
Success,  
 
Adrian Lopez
Liquid Light Digital

To export out morph targets you need the Point Oven plugin and you run it under LW. From LW you export out as a Point Oven scene with all your morph targets.  When you import the Point Oven Scene PSC file it has them as blend shapes on the object.
 
I will try to find the test XSI files that I finally got to work that used the Magpie converter.  This automatically put the curves onto the blendshapes as they were in TAFA.  The only downside is that you can not do the asymetrical blending that TAFA does, you need to use Point Oven.  The same is with Morph files in LW versus using MDD files.