GS Compatible Voice List
GS Means GM Standard
GS was developed by the Roland Corporation. GS Voices (Only for Song Playback)
We cannot View and use GS Voices like Panel/XG/GM2 Voices. 
These can be viewed only through Song Revoicing. We can insert these voices
to the MIDI tracks through SongCreator/Channel/Setup/Execute/Save.
When we view through '1-16' Edit Window we can see the Parameters of the GS Voices
The MSB Value of GS for Voice is 119 and Drum is 118
This setup Included first in PSR-3000, PSR-1500 (©2004)  and continued in later Models. 
There are 235 GS Voices (226 Voices + 9 Drums) in one folder.
Sl. No Voices Parameters
1 Piano1 119-000-000/001
2 Piano1 Wide 119-008-000/001
3 Piano1 Dark 119-016-000/001
4 Piano2 119-000-001/002
5 Piano2 Wide 119-008-001/002
6 Piano3 119-000-002/003
7 Piano Wide3 119-008-002/003
8 Honkytonk 119-000-003/004
9 Honkytonk Wide 119-008-003/004
10 ElectricPiano1 119-000-004/005
11 DetunedEP1 119-008-004/005
12 ElectricPiano1 Wide 119-016-004/005
13 60sElectricPiano 119-024-004/005
14 ElectricPiano2 119-000-005/006
15 DetunedEP2 119-008-005/006
16 ElectricPiano2 Wide 119-016-005/006
17 Harpsichord 119-000-006/007
18 Coupled Harpsichord 119-008-006/007
19 Harpsichord Wide 119-016-006/007
20 Harpsi KeyOff 119-024-006/007
21 Clavi 119-000-007/008
22 Celesta 119-000-008/009
23 Glockenspiel 119-000-009/010
24 MusicBox 119-000-010/011
25 Vibraphone 119-000-011/012
26 Vibraphone Wide 119-008-011/012
27 Marimba 119-000-012/013
28 Marimba Wide 119-008-012/013
29 Xylophone 119-000-013/014
30 TubularBells 119-000-014/015
31 ChurchBells 119-008-014/015
32 Carillon 119-009-014/015
33 Santur 119-000-015/016
34 Organ1 119-000-016/017
35 DetunedOrgan1 119-008-016/017