Calf Reverb LADSPA effect won't work properly

Ubuntu version: 12.04.1 Precise (using Ubuntu 2D)
Audacity version: 2.0.0
Package: audacity 2.0.0-1ubuntu0.1

Whenever using Calf Reverb LADSPA effect, modifying the parameters (Decay Time, High Frq Damp, Room Size, Diffusion, Wet Amount, Dry Amount, Pre Delay, Bass Cut, Treble Cut) won't change anything to the final result. Consequently, using it on a same track with different sets of parameters will end up on the exact same track.

Instead, I expect Calf Reverb LADSPA to modify the selected track according to the parameters I indicate.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: audacity 2.0.0-1ubuntu0.1
ProcVersionSignature: Ubuntu 3.2.0-30.48-generic 3.2.27
Uname: Linux 3.2.0-30-generic x86_64
AlsaCards:
 0 [PCH ]: HDA-Intel - HDA Intel PCH
                       HDA Intel PCH at 0xf7b00000 irq 56
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
Date: Wed Sep 5 20:42:52 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: audacity
UpgradeStatus: Upgraded to precise on 2012-04-29 (129 days ago)