How does Bus Comp Classic compare to the 500-series G-Comp module and THE BUS+?

The G-Comp is a great way to access the SSL Bus Compressor in a double-wide 500-series module, whereas Bus Comp Classic allows you to have the SSL Bus Compressor in a 1U rack unit, with the added benefits of VCA Drive and a stereo external input. THE BUS+ extends the Bus Compressor far beyond the original, with a suite of additional features and a 2-band dynamic equaliser (D-EQ). All 3 models use high-performance THAT 2181 VCAs as the gain reduction component.