I'm playing my PX-5S in a musical. In the synth part is lists of patch suggestions. In the score itself there are specific instructions, i.e.
(soft padding XV - E - 45, full range) with
Acoustic Bass (K2500 962 , C2 and down)
I know that some of the instructions are for splitting the keyboard, but are numbers XV, or K2500 962, geared towards a specific type of keyboard or are they indications for a general MIDI keyboard? I'm thinking the K2500 might be a Kurzweil reference but I'm not sure.