Good video, SSG. I had the privilege of auditioning as a bass trombonist for Pershing's Own back in the 70s. I didn't make the final cut but no regrets. I started on bass trombone on a Reynolds Contempora Stereophonic in 1970 and moved to the King Duo Gravis (6B) in 1977 until the time I quit playing in 2010. I used the Remington warm-ups as written and extended them to the bass trombone range as well for long, daily warmup/workout. I did the Rochut books (I and II) as written and down an octave as well. What I was most proud of, was being able to play the Tommy Pederson Advanced Etudes for BassTrombone as if they were second nature. I found that most young bass trombonists concentrate on the low register (the gutter) and ginormous mouthpieces and tend to ignore the upper register. Big mistake. One of the best long-term gigs I ever had, was as a single trombonist (with a top nome entertainer) being able to spend time in the upper register as well as the lower register. I used a Bach 1.5G mouthpiece and my Duo Gravis for this.
I recognize the arpeggio exercise (3:32) from my Arban book. Besides other brass instruments, I play both straight tenor and valve trombones, but just ordered a used Yamaha YBL-321 bass trombone off eBay.
Rochut Melodious Etudes. There are three books.They can be found at many music stores on line, Amazon being one of them. They are an essential part of trombone literature.