Ableton Forum

with regards to audio, crossfade loop synth effect should allow you to do what you want.

http://www.expert-sleepers.co.uk/xfadelooper.html

check the demo or the manual.

it's the triple chorus that gives the Arp Omni and the Solina/Eminent String Ensemble their characteristic sounds.

the Arp chorus circuit uses three different delay settings, and different lfo settings for the 2 lfo's + some phase tricks with the lfo's.

the Roland RS-09 uses a different chorus ...