Hi 'sync playback to display' That changes the audio and video playback to play at the refresh rate your device is set at in Android Display Settings. The audio and video then both play faster and sometimes slower to adjust to the refresh rate. Since there is lots of processing involved that changes the whole time, it only works with stereo output and thus pass-through won't work with this setting enabled. But it will make 23.976fps videos play smoother. To bring up the video 'info' screen you can press the letter 'o' on an airmouse or bluetooth/USB keyboard. Maybe with the keymapper Programs addon, you can program a key on the Zidoo remote to enable that shortcut? You can also press the letter 'z' to zoom and change the aspect ratio of a video eg. zoom, stretch 4:3 to 16:9 non linear, wide zoom etc.