Re: ***invader Sh-8***
There's no way you gonna hear 500 Kohm versus 1 Mohm if you only exchange the volume potentiometer and play through moderate or high gain.
If you wanted a softer, mellower sound you could go and simulate a tone poti with a resistor and capacitor inside the electronics cavity and maybe go 250 Kohm on both potentiometers. But it sees you want the opposite direction, in which case the only thing to do is make sure your guitar cable is high quality and not too long.
Otherwise, if you don't like it you'd have to exchange it with something else.