The biggest issue you can have by turning up the level high with the Nebula input is that this is like sending a hotter signal into the input of a piece of hardware. It will drive the device harder, which CAN be cool, but not always wise. The input control on Nebula is not just a transparent level, it is setting how high or low your audio is hitting the input of whatever hardware the preset is emulating.
xyxxjx wrote:I want to set my system up calibrated @ -18db using nebula in reaper, can someone tell me how to go about that or maybe point to a good guide.
In Reaper you could use the SWS function "SWS: Normalize item(s) to peak RMS", the level could be set through the function "SWS: Set RMS analysis/normalize options". Of course is less accurate than setting levels track by track with a VU meter plugin, but a very nice shortcut: in a single step you can select all tracks and apply the normalization directly on items.