More duets on Bordogni

[BflatBass]

This is an 'extension' of the post by bubba7753 about Rochut duets.

I'm wondering if anyone has written any counterparts to the Bordogni vocalises arranged by Allen Ostrander for bass trombone. I'm trying to concentrate my practice on the bass and I really like the duets based on the Rochut/Bordogni etudes written by Tom Ervin. I know I could probably find duet books for two bass trombones but I was just wondering if this has been done for the Ostrander book.

I know I could re-write the Ervin counterparts down in octave and in the proper key to coincide with the Ostrander etudes but if someone's already done it that would save me some work.

Cheers,
Robert