What's with the volume buttons while in a call?

[mobidutch]

I have two questions about using the hardware volume buttons while in a call.

1. When I am in a call (the dialer app is active) and I press volume up or down once, the graph will show the volume going up or down by two lines. But the next time I press the same button, the starting level is right back where it was before.

2. When I press and hold the volume up or down button while in a call, the screen flashes back and forth between the HTC volume slider graph and teh dialer app, and the volume only changes by one notch.

Is this supposed to work this way????? Thx!