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1. Is there a way to make a model that is transparent with a color?
I have heard of this. Make the texture so that it has stripes or checkers that are two pixels wide alternating with black the same width. Set the face type to mtm2 transparent. This will give you a simulated semi-transparent colored effect. Try it and let us know if it works.
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2. how do I get my sound into the list of impact sounds to chose from in Traxx?
You don't actually get it into the list. Click the "..." button and browse to it.
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<IMG SRC="http://mtm2.com/~mtmg/Traxx/objects/images/sounds.gif" border=0></center>
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