I'm having issues with the 64-bit version of the plugin (both VST 2.4 and VST 3, same problem) in Studio One 4 on windows 10x64. The signal gets incredibly low even with the gain knob all the way up and the peak knob all the way down. The dry\wet knob makes no effect at all.
To anyone using it on a master bus, be aware of the high frequency roll-off. It starts at around 8 kHz and takes away around 1,5-2 dB. I tested it with SC HPF and DRIVE both at 0%, with only 1 dB of gain reduction, 100% WET.