I've been assured that the "dangers" of pulling slides without depressing
the valves has more to do with the sanity of the teacher than with the
instrument. Certainly a roomfull of kids popping slides during a rehearsal
must be
infuriating and any tale which stops them doing it is a winner as far as I'm
concerned.
If your students won't practice, tell them that the noises they make will
make their pet kitten shrivel up and die - it might work!
Cheers,
Lawrence
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