i managed to get the Ronka Daily Warm ups and Drills from Pender Music Company Texas
it arrived by post today and was only $5 a bargain
On their site it now say's it is temporaily out of stock but i have ordered another one for a pupil.
so i will soon find out if it is still obtainable or out...
I have this excellent book by Ilmari Ronka, "Modern Daily Warm-Ups and Drills"
i feel it has everything in the 40 min warm up routine,
The drills are great too ,with some nice reminders for alternate positions.
For me it covers all the essential aspects of trombone playing, breathing, excellent...