Please note that some of these instruments may never be possible on the soundfont.
It is HIGHLY suggested that you load a FULL GM SoundFont before you load up this one.
eg: Not clearing the current soundfont on your Soundfont options, and loading the YM/FM Soundfont.

9=Glockenspiel
13=Xylophone
18=Rock Organ
20=Reed Organ
21=Accordion
22=Harmonica
23=Tango Accordion
25=Acoustic Guitar (steel)
27=Electric Guitar (clean)
28=Electric Guitar (muted)
42=Cello
43=Contrabass
44=Tremolo Strings
45=Pizzicato Strings
47=Timpani
51=SynthStrings 2
53=Voice Oohs
54=Synth Voice
55=Orchestra Hit
59=Muted Trumpet
64=Soprano Sax
65=Alto Sax
66=Tenor Sax
69=English Horn
70=Bassoon
72=Piccolo
77=Skakuhachi
78=Whistle
83=Lead 4 (chiff lead)
85=Lead 6 (voice)
88=Pad 1 (new age)
89=Pad 2 (warm)
90=Pad 3 (polysynth)
92=Pad 5 (bowed)
93=Pad 6 (metallic)
94=Pad 7 (halo)
95=Pad 8 (sweep)
97=FX 2 (soundtrack)
99=FX 4 (atmosphere)
100=FX 5 (brightness)
102=FX 7 (echoes)
103=FX 8 (sci-fi)
105=Banjo
107=Koto
109=Bagpipe
110=Fiddle
111=Shanai
112=Tinkle Bell
115=Woodblock
116=Taiko Drum
119=Reverse Cymbal
120=Guitar Fret Noise
121=Breath Noise
123=Bird Tweet
124=Telephone Ring
125=Helicopter
126=Applause
127=Gunshot