I have my ambient waterfall sound playing and working just fine, but I'd like to set it up so that when you go inside the house, the sound volume decreases by about half.
I'm fairly certain I need to set up a sound region to accomplish this, but I have no idea what the alcscript would need to look like. The Wiki gives script for fadein and fadeout, but I'm thinking that's not exactly what I'm going for. I just want the volume to decrease, not for it to cease all together.
I know enough to know I should know how to do this, but don't

Help please?

~Kia