Why not just use the model? Glitches are fixable and there shouldn't be much problems as Falcon already has all the needed bones - he's a playable character after all.
Try exporting your .wavs in Audacity everytime you want to insert them. Or put a test sample which you know does work before you want to insert something.
I'm going to release Sawndz 0.11 tomorrow. It will now pick the frequency not from wav file, but from spt. It should fix many problems, if it doesn't, there is not much I can do about the problematic wavs.
If clicking on a Wave in SmashBox gives you an error, it means you can't preview it - that wave has nothing. I haven't tested if these can be replaced, they should be.