Newbie question audioloops

Confused about audioloops :confused:
I understand the midiloops and what you can do
I thought audiolopps would works similar, but they don´t.
Audio seems more complicated then midi, and I havent yet understand
For example a baseloop in midi it´s only one key, but in audio 3 keys,
so what to do? cut out the key/keys you want? :cry:

Have been testing Cubase 8,5 PRO Trial and now it´s only 4 Days left
and I don´t know if I want to buy it because it´s so much more comlicated than Elements :unamused: