Control-Key Shortcuts

ESC - Remove any visible overlay. If no overlays are present and digital text is being shown then this will remove the text display.
A - Toggle Audio Description On/Off
B - Toggle DVB Subtitling On/Off
C - Capture Frame (Digital or Analogue Video)
F - Toggle through the full-screen/Windowed display modes
L - Toggle through the available video deinterlacing methods
M - Mute Sound Toggle On/Off
P - Pause/Play
Q - Toggle between Silent (Quiet) mode on OTR and Timer recordings
R - Start/Schedule Recording (Digital TV Mode Only)
S - Stop Playback/Recording
T - Toggle Digital Teletext On/Off
V - Toggle Video On/Off
X - Zoom Out
Z - Zoom In

or
Plus Key - Change channel Up
or Minus Key - Change channel Down

Left/Right Arrows - Depends on the currently active overlay:
Overlay Function
None Adjust the volume up or down (Use with the SHIFT key to change the Audio Description volume)
Any Menu Step through each menu item
Now & Next Move through the channels displaying the now/next information without changing the channel

Up/Down Arrows - Depends on the currently active overlay:
Overlay Function
None Change the channel up or down
Any Menu Step through each menu item
Carriage Return - Select
Spacebar - Show the Media Player Window