Lost tape, you say? I can easily identify most of these instrument patches, but I have to say, the arrangement, while odd, is more than just the sum of its parts. While seemingly wonky, it retains a cohesive theme -- enough repetition to retain legitimacy without being skull-numbingly boring. It'd probably have better served your piece to have the melody outside of the mallets for such slow lines, though, or at least supported with another instrument. Who knows, maybe even a harmony with a second clarinet.
Overall, not a bad piece. Crazy to think it's been sitting here unmolested in misc for over a year. I'm going to move it to the proper genre.
Ps, come back yo.