Hi Tarald,
If you are using the Media Stores for animation playback you would use the MediaWipe Keyer and not any of the standard ME keyers, in this mode the wipe is always over all keys. It also means that all four ME keys are available for other sources.
To use this simply select MediaWipe as the transition type, this automatically turns on the hidden transition key, then choose the source (media store 1 or 2) and load content.
I should also point out that you can easily swap position of any of the keyers you have assigned. Simply press and hold the key layer you want to change (i.e. Key 4) in the transition area, then press the key you want to swap with in the key select area above the delegate bus (i.e. Key 2). That will swap the content on layers 2 & 4, so you can easily move your keys sources to any layer. This action can also be recorded in memories and custom controls.
Nigel
#Carbonite