The Bug
The Fix

bcbug-before.mp3 |

bcbug-after.mp3 |

breath_test.thor |
My recommendation: If you care about your sound (and who doesn't?) upgrade to Reason 5.0.1 and/or Record 1.5.1. Not only do you get this fix, but you get all the other various fixes that go along with this maintenance release.
Thanks, Props, for making Reason work even better with wind controllers!