Blackmagicdesign ATEM Mini Installation And Operation Manual page 26

In cut bus mode, pressing an input button will instantly switch it to air
Program Preview
In program preview mode, switching a source is a two step process. This is because pressing
an input button puts the source in a preview state so you can decide whether you want to
switch it, or perhaps select a different input source. This powerful switching mode is used by
professional broadcast switchers across the world.
TIP If you connect an HDMI monitor, for example Blackmagic Video Assist, to
ATEM Mini's HDMI output you can output the preview signal and monitor the
selected input before switching it to air. For more information, refer to the 'setting
the HDMI output source' sectionn later in this manual.
In program preview switching mode, press an input button and then
press the 'auto' or 'cut' button to switch the source to air
ATEM Software Control 26