On some receivers which have an oversize ring at the opening, it may be necessary to push the clamp past that before tightening down. You may experiment with it in other positions to determine what is best for you. Once the BERP is firmly attached, you can then alternate easily between buzzing and playing your instrument by switching the mouthpiece. The dial for the trumpet, horn and cornet BERP should be positioned below the holes and pushed up to cover however much of the holes creates the desired resistance. The dial on the BERP for trombones, euphoniums and tuba should be positioned above the holes and lowered to create the desired resistance.
Beginners usually have a better chance of getting a good buzz with slightly more resistance.
Once a good buzz is achieved, resistance on the BERP should then be dialed similar to that on the instrument. Play slowly, using the top treble line for trumpet, cornet and horn, and the bottom bass line for trombone, euphonium and tuba. Clamp the BERP onto the receiver. Play the starting pitch on your instrument, then place the mouthpiece in the BERP and buzz the exercise like a siren or glissando. Buzz the exercise again, but this time play the notes from center to center and press the valves down or move the slide to the notes that you are playing.