VolumeShaper and WaveShaper CM can now be used on mono channels, too. If you’re using Logic, you might need to select and rescan these plugins in Logic’s Audio Units Manager.
VolumeShaper for Windows and Mac (VST/AU/RTAS) is available to purchase for 15 EUR / $20 USD. WaveShaper CM comes free with Computer Music magazine.
More information: Cableguys