What is "GM Program"?

[KORG2]

In the document "microSTATION_VoiceNameList.pdf" there are the lists of the PROG and COMBI modes (with extra keys on the microStation), but there is also a "GM Program" list with voices. What is this and how can I activate these voices?

Is this the "General Midi" soundset it is written on the microStation homepage:

A full General MIDI level 2 compatible soundset allows commercial and pre-made MIDI files to be played perfectly and instantly.

So, how can I switch my sounds to these General Midi sounds? (Global/Media > Basic > Bank Map: GM(2) doesn't change anything ...)