Hello, found nothin about Sidechaining with Cubase 6 and alle NI Compressors with Sidechain Option in Guitar Rig 5. So here is how it works: 1. First create a Group with Quadro Setup. Then you have to add subgroups to the Quadro Group (Stereo and Stereo (Ls Rs)) in the VST Connections Window. 2. Route the Bass you want to sidechain to the Quadro Group subgroup Stereo. 3. Route sidechain Bassdrum to the Quadro Group Stereo (Ls Rs) Subgroup. 4. Turn on the Sidechain Switch from the NI Compressor inside Guitar Rig ( tested with Vintage Compressors and Solid Bus Comp). Now you have a fine Sidechain Compressor ;-) you just have to tweak the threshold and the attack/release parameters.