A timbre is a word that essentially means “separate tone color”. It is
fairly commonly used interchangeably with “instrument,” “program,” etc.
It is also the word used to describe the 8 “tracks” that are available in a
Combi, in order to differentiate the fact that you can’t actually record anything in Combi Mode (Combi Mode has 8 timbres, Sequencer Mode
has 16 tracks.)