In PV mode (selected in Song Select)

Commands:​
On the Start Screen: Hold R (Vita) / R1 (PS3) + Start PV = Play PV with no vocals.
During PV Mode: X = Toggle Lyrics On/Off

In Television (DIVA Room Item/Gadget)

Commands:
During PV mode:
X = Toggle Lyrics On/Off
Square = Toggle Repeat PV On/Off
Circle = Play/Pause PV
Left D-Pad = Restart PV; Previous PV (during the first second after PV starts)
Right D-Pad = Next PV

While in Loading Screen:
Hold R = Play PV with no vocals

In AR Live Mode (PS Vita Version only!)

Commands:
PSVita System = Move around to view at different perspectives (while pointing the camera at the marker)
X = Toggle lyrics On/Off
Up/Down D-Pad = Change Miku's size (Figurine size [1/6] -> Desktop size [1/2] -> Life size)
R = Take screenshot
Select = Show HUD