Just a thought here, reversed events look like, well, really good. Tape being rewound doesn't. So if you want realism, copy your stuff to (shudder) VHS and record the output of a machine being rewound. I don't know of anyway in Vegas to simulate the line tearing etc that happens with tape being rewound.
Bob.
Bob! - "copy your stuff to (shudder) VHS and record the output of a machine being rewound." That IS definitely a keeper . . I like it . . I like it! PLUS you would need a sound akin to something going into reverse . . - G