Thread:Trigger009/@comment-1352718-20141104155305

I gave proof and listed the sources of when the Omnitrix quick changed prior to being recalibrated with the latest sources being from Ultimate Alien's The Forge of Creation where Ben changed his younger self's form and in the 2012 movie Destroy All Aliens where Tetrax set the Omnitrix to keep on switching Ben's alien forms.

Those are two instances that quick change was possible. Also on Ben 10 Omniverse,  a pre recalibrated Dimension 23 Omnitrix (only palette swap of the original Omnitrix) was shown to quick change in the season finale Mad Mad Ben World.  