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Here is a nice presentation by Arnold Jacobs, given at the International Brass Congress in 1984. This is the complete recording, at about an hour and 25 minutes. There is a short missing bit where the tape runs through the leader as it switches from side 1 to side 2. Also, I did my best to level the volume, which was highly variable. Enjoy!

https://www.youtube.com/watch?v=ajeBJROfvtY