Hi Johnny,
i wonder if your version of Night Train as described on the Repertoire subpage is in Bb for Tenor Saxophone. I checked your demo and you really played it in Bb, so the guitars etc play it in Ab. I always thought the tenor saxophone will play it in C and the guitars in Bb.
The guitars are in Ab. The tenor is in Bb. This is the best key for the song because you can really make that that low Bb really honk. Not quite the same on any other note, or not as effective on the alto either.