mime the conductor and then stop when he looks over.
A conducting coup?

Take over the ensemble?
How about miming the instruments too? You could mime playing the piano I guess as well. When the violinist plays a solo, mime him or her and point to the violinist so the audience knows for sure who's playing. Look to the audience and give a big head nod of approval. Give the violinist a big thumbs up with an Enzyte smile and try to get the audience to clap when the solo is over.

Mm, yes. That would be quite freaky to see a soloist sitting there while the ensemble plays with this smile on his face...
