Tracker commands

0 Normal play or Arpeggio 0xy: Arpeggio, x = first halfnote add, y = second halfnote add
1 Slide Up 1xx: up speed
2 Slide Down 2xx: down speed
3 Tone Portamento 3xx: up/down speed
4 Vibrato 4xy: x = speed, y = depth
5 Tone Portamento + Volume Slide 5xy: x = up speed, y = down speed
6 Vibrato + Volume Slide 6xy: x = up speed, y = down speed
7 Tremolo 7xy: x = speed, y = depth
8 FastTracker panning extension 8xy: 800 is hard left, 8FF is hard right
9 Set Sample Offset 9xx: offset (23 -> 2300)
A Volume Slide Axy: x-upspeed, y-downspeed
B Position Jump Bxx: song position
C Set Volume Cxx: volume, 00-40
D Pattern Break Dxx: break position in next pattern
F Set Speed speed (00-1F) / tempo (20-FF)

Extended Commands
E0 Toggle Filter E8 *not used*
E1 Fine pitch slide up E9 Retrigger note
E2 Fine pitch slide down EA Fine volume slide up
E3 Glissando control EB Fine volume slide down
E4 Vibrato control EC Cut note
E5 Set instrument fine tune ED Note delay
E6 Pattern loop EE Pattern delay
E7 Tremolo control EF Invert loop

XM Extended Commands
G Set Global Volume Gxx
H Global Volume Slide Hxx
K Key-Off Kxx: xx is the delay in ticks
L Set Envelope Position * Not implemented
P Panning Slide Pxy
R Re-trigger note with volume slide * Not implemented
T Tremor * Not implemented
X Extra fine portamentos Xxy: x=1: y speed up, x=2: y speed down

XM Volume Commands
xx Set Note Volume From 00 to 40 (hex)
+x Volume Slide Up + + speed
-x Volume Slide Down - + speed
Dx Fine Volume Slide Down D + speed
Lx Panning Slide Left L + speed
Mx Portamento to note M + speed
Px Set Note panning position P + position
Rx Panning Slide Right R + speed
Sx Set Vibrato Speed S + speed
Ux Fine Volume slide up U + speed
Vx Vibrato V + speed

For a more detailed explanation, please refer to the Protracker Command Reference
and the FastTracker Manual