No dynamic range compression option?

[KingHeight]

Software
XBian version: 1.0Beta1.1
XBMC version: 12.2
Overclock settings: default

Hardware
Power supply rating: 1200 mA
RPi model (model A/B 256mb/512mb): B/512mb
SD card size and make/type: Kingston 8Gb Class 10
Network (wireless or LAN): ethernet
Connected devices (TV, USB, network storage, etc.): USB keyboard

Logile
Link to logfile(s): http://sprunge.us/KRGT

Problem description:
I cannot find the Dynamic Range Compression setting. I would very much like to enable it because our walls are thin and our sound system is powerful. I saw on XBMC's wiki that it is supposed to be with the sound settings but the option is simply not there.
How can I add it?
Thanks!

How to reproduce:
N/A