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Here's a chart on what you can assign to your device's built-in footswitches, attached Switch-3/6, or Mic Control device.
 
VoiceLive 3
VoiceLive 3 Extreme
Buttonmap Parameters

uMod
Delay
Reverb
Voc Hit
Double
Harmony
Transducer
HardTune
Rhythmic
Stutter
Choir
Synth
Harm Hold
Set Key
Tap Tempo
Bypass
G uMod
G Delay
G Reverb
G Hit
G Comp
G Drive
G Amp
G Rhythm
G Octaver
G Wah
G Mute
All Hit
1ButLooper
LoopTrig A
LoopTrig B
LoopTrig C
LoopTrig D
LoopTrig E
LoopTrig F
LoopTrig G
LoopTrig H
 
Step button parameters

Step
Pitch Cor
All Mute
μMod
Delay
Reverb
Voc HIT
Double
Harmony
Transducer
HardTune
Rhythmic
Stutter
Choir
Synth
Harm Hold
Set Key
Tap Tempo
Bypass
G μMod
G Delay
G Reverb
G HIT
G Comp
G Drive
G Amp
G Rhythm
G Octaver
G Wah
G Mute
All HIT
Looper
Loop Input Cycle
Footswitch parameters
 
STEP
PITCH COR
ALL MUTE
μMod
Delay
Reverb
Voc HIT
Double
Harmony
Transducer
HardTune
Rhythmic
Stutter
Choir
Synth
Harm Hold
Set Key
Tap Tempo
Bypass
G μMod
G Delay
G Reverb
G HIT
G Comp
G Drive
G Amp
G Rhythm
G Octaver
G Wah
G Mute
ALL HIT
Go Looper
Loop Input
Tuner
1ButLooper
LPlayRec
LStopErase
Loop Undo
L Erase All
Expression Pedal parameters

Off
Lead Octave Down
Lead Octave Up
Harmony Octave Down
Harmony Octave Up
Harmony + DoubleLevel
Delay + Reverb Level
Harmony Level
Double Level
Vocals μMod Level
Vocals Delay Level
Vocals Reverb Level
Synth Level
Lead Level
Vocal μMod + Delay + Reverb Level
Vocal Level
Aux Level
Vocal Delay Sends
Vocal Reverb Sends
Rhythm Depth
Rhythm Division
Stutter Division
G μMod Level (G = Guitar)
G Delay Level
G Reverb Level
G Delay + Reverb Level
G Rhythmic Depth
G Rhythmic Division
G Amp Post Gain
G Amp Pre-Gain
G Level
G Pan
Looper Level
Headphone Level
G Delay Send
G Reverb Send
 
Mic Switch parameters

    Off 
    μMod 
    Delay 
    Reverb 
    Vocal HIT 
    Double 
    Harmony 
    Transducer 
    HardTune 
    Rhythmic 
    Stutter 
    Choir 
    Synth 
    Harmony Hold 
    STEP 
    Tap Tempo 
    Bypass 
    ALL HIT 
    Preset UP/DN 
    Preset Step 
    Tuner 
    1 Button Looper 
    Loop PLAY/REC 
    Loop STOP/ERASE 
    Loop UNDO 
    Preset UP 
    Preset DOWN 
Buttonmap Parameters

uMod
Delay
Reverb
Voc Hit
Double
Harmony
Transducer
HardTune
Rhythmic
Stutter
Choir
Synth
Harm Hold
Set Key
Tap Tempo
Bypass
G uMod
G Delay
G Reverb
G Hit
G Comp
G Drive
G Amp
G Rhythm
G Octaver
G Wah
G Mute
All Hit
1ButLooper
LoopTrig A
LoopTrig B
LoopTrig C
LoopTrig D
LoopTrig E
LoopTrig F
LoopTrig G
LoopTrig H
Track Start
 
Step Button Parameters

    Step 
    Pitch Cor 
    All Mute 
    μMod 
    Delay 
    Reverb 
    Voc HIT 
    Double 
    Harmony 
    Transducer 
    HardTune 
    Rhythmic 
    Stutter 
    Choir 
    Synth 
    Harm Hold
    Set Key 
    Tap Tempo 
    Bypass 
    G μMod
    G Delay 
    G Reverb 
    G HIT 
    G Comp 
    G Drive 
    G Amp 
    G Rhythm 
    G Octaver 
    G Wah 
    G Mute 
    All HIT 
    Looper
    Loop Input Cycle 
Footswitch parameters

STEP
PITCH COR
ALL MUTE
μMod
Delay
Reverb
Voc HIT
Double
Harmony
Transducer
HardTune
Rhythmic
Stutter
Choir
Synth
Harm Hold
Set Key
Tap Tempo
Bypass
G μMod
G Delay
G Reverb
G HIT
G Comp
G Drive
G Amp
G Rhythm
G Octaver
G Wah
G Mute
ALL HIT
Go Looper
Loop Input
Tuner
1ButLooper
LPlayRec
LStopErase
Loop Undo
L Erase All
Loop Trigger A-H
Track Start
Track Stop
Track Forward
Track Backward
Seq Rec
Seq Undo
Expression Pedal parameters

Off
Lead Octave Down
Lead Octave Up
Harmony Octave Down
Harmony Octave Up
Harmony + DoubleLevel
Delay + Reverb Level
Harmony Level
Double Level
Vocals μMod Level
Vocals Delay Level
Vocals Reverb Level
Synth Level
Lead Level
Vocal μMod + Delay + Reverb Level
Vocal Level
Aux Level
Vocal Delay Sends
Vocal Reverb Sends
Rhythm Depth
Rhythm Division
Stutter Division
G μMod Level
G Delay Level
G Reverb Level
G Delay + Reverb Level
G Rhythmic Depth
G Rhythmic Division
G Amp Post Gain
G Amp Pre-Gain
G Level
G Pan
Looper Level
Headphone Level
G Delay Send
G Reverb Send
 
Mic Switch parameters

    Off 
    μMod 
    Delay 
    Reverb 
    Vocal HIT 
    Double 
    Harmony 
    Transducer 
    HardTune 
    Rhythmic 
    Stutter 
    Choir 
    Synth 
    Harmony Hold 
    STEP 
    Tap Tempo 
    Bypass 
    ALL HIT 
    Preset UP/DN 
    Preset Step 
    Tuner 
    1 Button Looper 
    Loop PLAY/REC 
    Loop STOP/ERASE 
    Loop UNDO 
    (Backing) Track Start
    Preset UP 
Preset DOWN