browse through the "PACKS" folder in your library window (on the left).
then right click on a packs name/folder and there is an option to open this "large window" from the beginning... its something like a tutorial or content summary.
does the fader react to the input or is there no input at all?
how is the routing in this Audio Track applied?
maybe a screenshot could help to see if your routing is correct?
and the hardware configuration in the Live preferences is correct too?
what is if you chose another output, not the Apollo?
what speakers/headphones are connected to the apollo? (maybe a defect there)
is there a monitor option that you have to activate/deactivate?
1. create an audio track
2. load your loop
3. load Reaktor FX into this audio track
4. create new MIDI track
5. in MIDI TO choose the audio track with your loop and Reaktor FX plugin
then the Reaktor FX plugin should be chosen automatically