In many circumstances adjusting the input gain of the channel will handle this nicely.
Careful though if you are using some kinds of plugs. For example with distortion the intensity will change and with compression, the threshold point will need to be adjusted.
Cubase 8.0.5 Build 418
System 1: AMD FX 8350 8 core 16Gb Win 7 64 Asus M5 A97
System 2: AMD FX 8320 8 core 16Gb Win7 64 Biostar A960D+
nb. Systems optimised using CoreParkingManager45. Windows 7 by default "parks" 4 cores on my systems and Cubase doesn't override this limitation - reduces peak performance. The problem is fixed I believe in Win8