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 6.5.5 Build 176 (still XP Pro SP2). Second system: AMD FX 8320 Eight Core 16Gb Win7.
...Yes, I like the extra RAM and it is faster than my trusty XP - but not by that much.
JBridge - absolute Godsend. Steinberg bridge is flaky.