As a Bass Trombonist I must take issue with the Toronto Symphony version of the Polevetsian Dances you played in the previous hour. In the 3/4 section the Bass Trombone down beats were obliterated by the timpani.
Several possibilities come to mind:
The Bass Trombonist was either absent or incompetent
The conductor was at fault allowing the Timpanist to overpower the Bass Trombone
The recording engineer did not place the mikes properly
You have other recordings which are correct in the balance between the Timpani and the Bass Trombone. In the future please play one of those rather than the Toronto. Thank you.