A few hints:
You can determine by Rig, where in the signal chain Volume Pedal is located. If you select for example "Post Stack" or "Output", it won't affect the gain. If you select "Input" or "Pre Stack" it will. The parameter is Volume Pedal Location in Rig Settings.
Control change #7 is a continuous controller with a range of 0-127. The controller is gradual and Volume Pedal is. There is a parameter Volume Pedal Range, which allows to limit the minimum. But there is no setting at the PROFILER side, which just allows off and maximum Volume Pedal. Perhaps you are treating CC#7 like a switch instead of a continuous controller in your software.
I suggest you read the chapter about the Volume Pedal in the manual, which explains the whole concept. Understand first, then automate.
Not sure, what you exactly mean by "contorll pedal serve different functions on different Performances)". Perhaps the answer is "Morphing". There is also a chapter dedicated to that subject. The corresponding MIDI contoller is #11.