Sonnox Oxford Preset Manager - Manual (Page 9)

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3.6 A/B Selection
The A/B button (to the right of the ToolBar) allows you to compare two sets of settings with
a single click. Whenever this button is clicked, the current settings are saved into a backup
store, and the contents of the backup store moved to the current settings. Initially, the backup
store is loaded with the default state of the plug-in on start-up, so use of the A/B button will
compare whatever plug-in settings you have created to the default settings, which will usually
be equivalent to comparing audio with and without the plug-in affecting the sound. However,
if you switch to the default settings and change them, this is what the other settings will be
swapped to or compared against. Thus the A/B button allows you to quickly compare the
audio with and without the plug-in, or compare one setting against another.
If you click on the A/B button and hold the click for half a second, a sub-menu will appear
(see above). This enables you to copy the current settings over into the backup store so that
you can sync the two together before making some changes for the careful comparison of
sounds.