How to enable replay gain in Airtime 2.1.3

I just finished using mp3diags to fix problems in the MPEG headers of some mp3 files in my library.  In the process I used the normalize feature which is based on mp3gain to compute re-play gain for all my songs (yes, this took quite a while).  How do I enable replay gain in Airtime 2.1.3 or is it automatic?  I couldn't find any mention of replay gain in the Airtime 2.1.3 documentation.  I found an article in the FAQ which has a modification to ls_script.liq to enable replay gain.  I looked at the file and it appears the suggested modification is for a previous version (at least I could not find the same "s" declaration line mentioned in the FAQ).  Here is an excerpt from the FAQ:


enable_replaygain_metadata ()


s = amplify(1.,override="replay_gain",s)





these 2 lines I've added right after the first declaration of 's' in ls_script.liq
(it's exactly right after s = fallback(track_sensitive=false, [queue, default]))