For a piece I am performing with a local school orchestra, a final open A is to undergo an "insane" crescendo to a Fortissississimo, which our conductor interprets as "as loud as possible."
A fellow cello player suggested I play a double note with the same A being simultaneously played on the A string(as open A) and with the first finger down on the D string in fourth position(or an equivalent fingering in another position, but this one saves a shift), but he is not sure that is proper for performance. Is it proper, and will I sacrifice assurance I won't impede the A string with my fingers if I stay in fourth position for this?
I hope I've given enough details for a suggestion/answer.