Video and audio setup
How to adjust Slice's screen layout
If the Slice/Kodi text does not fit properly within the screen, then:
Goto: Setup -> XBMC Settings -> System -> Video output
First set the desired resolution (if not already correct)
Click on <Video calibration...>
First screen allows you to adjust the horizontal, ie. use the left/right cursor buttons until the right-angled line is properly in the TOP LEFT corner
Now you can adjust the vertical by using the top/down buttons to line up properly in the BOTTOM RIGHT corner
Now adjust the subtitles position
Now adjust the box until it's perfectly square
Click OK and then back out of the menu
How to install subtitles
The user needs first to select a ‘service’ to provide the subtitles:
Select: Setup -> XBMC Settings -> Videos -> Subtitles
Scroll down to <Default TV Service> and <Default Movie Service>
Select and then click <Get More…> on the next screen
After a pause to connect to the internet, a list of subtitle sites will be displayed
Select your preferred option (the original author uses subscene.com)
Start the movie and press OK on remote
Navigate to the left and select CC (Closed Captions)
Click OK – after a short pause a list will appear
Select your preferred option and navigate back to the movie
If the subs do not appear, click OK again and navigate left to the speaker icon
Click OK and tick <Enable subtitles>
Obviously unticking this will switch subs off
<Browse for subtitle…> will pick up any sub file saved on the hard drive which Kodi has not picked up automatically.
How to enable AC3/DTS 5.1 audio
IMPORTANT - this is NOT enabled by default! Your Slice is not equipped with audio decoders such as AC3 and DTS, so the original signal 'passes through' from the source and on to your receiver.
Select: Setup -> XBMC Settings -> System -> Audio output
IMPORTANT - DO NOT change line 2, <Number of Channels> – this does NOT apply to passthrough audio and thus should be left as <2.0>.
Scroll down to <Enable passthrough> and tick
Select the audio your receiver is capable of playing, eg. <Dolby Digital (AC3)>
If your AC3 movie is still not playing correctly, click OK, navigate left to the speaker icon and then ensure that the <enable passthrough> option is ticked.
How to play and organise 3D movies
There are three main 3D formats for movies. They are:
(Half) SBS (Side by Side)
This system involves the horizontal resolution of the HD image being reduced by half in order to store the left and right-eye images in a single frame. The sub-frames are thus stacked side-by-side. Each image will be sized 960x1080 pixels instead of the usual 1920x1080.
Note that Full SBS is possible, but is not supported by the Raspberry Pi and therefore not by Slice either.
(Half) Top-Bottom (Over-Under)
Same principle as SBS, but in this case the vertical resolution is reduced by half and the images are stored on top of each other.
Again, Full HTAB is possible, but not supported by the current version of Slice.
Blu-Ray 3D (FHD3D)
Also known as Full High Definition 3D, supports full 1080p content at the source. Not tested at time of writing (October 2015) but unlikely to be supported by Slice.
3D play procedure
Slice will 'semi-automatically' play 3d movies. The file is read and a menu appears with the correct format at the top. Select it and the movie will play. NOTE - ensure you have your TV set up for 3D first.
Avatar (2009).3d.htab.mkv (also known as .hou)
Slice's main movie scraper appears not to treat 3D versions any differently from the 'normal' version. The user will therefore have to either edit the movie name (press Ninja button on the movie's name) or write an NFO file with the relevant details (see here ).
The author found it useful to add the format to the movie's title name, eg.
Avatar 3D (htab)
This enables the user to quickly verify that Kodi is going to play the correct format.
Details on Kodi's treatment of 3D can be found here 
Details on 3D formats can be accessed here