Ok, I have Guitar Rig 5 software which is a guitar amp simulator. It comes with a VST. I use it in Vegas to add effects (amp settings and pedals etc) to my recorded audio. I know when you hover over the corner of a track it allows you to fade it in or out (increasing or decreasing the volume) A track with the Guitar Rig VST, doing the fade in or out, doesn't affect the volume, it affects the gain of the sound, making it either very thin or very thick sounding. The only way I can remedy this situation is rendering out that specific track and importing it back in. Then fading in and out works how it's supposed to.
Any solution, so I don't have to keep rendering out the track first.