7 ms·

Very little? More like none.

• iammyIP 9y ago
  it got very basic description in form of instrument index, so program 0 is piano, 4 guitar and so on.
• ssalazar 9y ago
  Program change + general MIDI instrument set is implementation-dependent but was pretty common in the 90s, and encodes timbre in an extremely limited way. Now of course nobody outside of fringe artists really use it.