34. A process, as claimed in claims 23, 24, 25 or 27, wherein the step of generating parameter signals includes the step of generating parameter signals that enable the accompaniment notes to sound in a plurality of different timbres and prevent the accompaniment notes from lying outside the range of any instrument being simulated by the timbres.
34. A process, as claimed in claims 23, 24, 25 or 27, wherein the step of generating parameter signals includes the step of generating parameter signals that enable the accompaniment notes to sound in a plurality of different timbres and prevent the accompaniment notes from lying outside the range of any instrument being simulated by the timbres. 41. Apparatus, as claimed in claim 34, wherein the memory means comprises means for storing signals defining information about the musical parameters of instrumentation, duration and pitch.