These effects can be used in the pattern editor of ImpulseTracker and it's clones.

Axx Set Speed
Bxx Jump to order
Cxx Break to row

D0x Volume slide down
Dx0 Volume slide up
DFx Fine volume slide down
DxF Fine volume slide up

Exx Pitch slide down
EFx Fine pitch slide down
EEx Extra fine pitch slide down
Fxx Pitch Slide up
FFx Fine Pitch slide up
FEx Extra fine pitch slide up

Gxx Portamento to note
Hxy Vibrato with speed x, depth y
Ixy Tremor with ontime x, offtime y
Jxy Arpeggio with halftones x, y
Kxx Dual command: Vibrato + Dxx (Volume slide)
Lxx Dual Command: G00 + Dxx (Portamento to and Volume slide)
Mxx Set channel volume

N0x Channel volume slide down
Nx0 Channel volume slide up
NFx Fine channel volume slide down
NxF Fine channel volume slide up

Oxx Set sample offset

P0x Pan slide down
Px0 Pan slide up
PFx Fine pan slide down
PxF Fine pan slide up

Qxy Retriggers a note after y frames with volume modifier x
Rxy Tremelo with speed x, depth y

S3x Sets vibrato waveform to x
S4x Sets tremelo waveform to x
S5x Sets panbrello waveform to x

S70 Past note cut
S71 Past note off
S72 Past note fade

S6x Pattern delay for x ticks

S73 Set NNA to note cut
S74 Set NNA to continue
S75 Set NNA to note off
S76 Set NNA to note fade

S77 Turn Volume envelope off
S78 Turn volume envelope on
S8x Set panning position
S91 Set surround sound
SAy Set high-offset. Check Oxx for an example
SB0 Set loopback point
SBx Loop x times
SCx Note cut after x frames
SDx Note delay for x frames
SEx Pattern delay for x rows

Txx Set tempo to xx
T0x Tempo slide down
T1x Tempo slide up

Uxy Fine vibrato with speed x, depth y
Vxx Set Global volume

W0x Global volume slide down
Wx0 Global volume slide up
WFx Fine global volume slide down
WxF Fine global volume slide up

Xxx Set panning position
Yxy Panbrello with speed x, depth y

Zxx Midi macro (00-7F controls filter cutoff, 80-8F controls filter resonance)