0.4.11-RC-34-g5e059e7 gcc dbg linux
VBox 4.3.12, AC97 driver from rapps was installed and working and did not 'suck'
OpenTTD 1.8.0 from rapps
In apps main menu we hear sound (like trains) and Midi music.
I just double-checked that on XPSP3
In apps main menu we hear sound (like trains) but no Midi music.