So help a noob... i'm getting closer and closer to finishing my first project i have maybe a month or so left at the rate i'm going. 
But ive run into 2 snags atm, one being pretty major the other being minor but something I would like to fix. 
So first problem, I'm using the free speedtree pack from the asset store and adding it into unity using the tree paint tool. Well in doing so the trees arent reacting to forces (atleast that I can tell) have a small white outline around each one of them, as well as they are basically cut in half. imagine a tree top with foliage floating and the roots showing but no in between. But as I get closer they become physical but still retain the white outline. When I add them directly from the prefab just drag and drop they have no issues.... any thoughts?

The small issue is, im using playmaker and i made collider boxes for playing sound as the player walks around the area. The code goes something like 
Start -> Trigger Collider -> Play Audio -> Exit Collider -> Stop Audio -> Enter Collider -> Play Audio (this play to stop being a loop so when the player reenters the trigger it begins playing all over again. The script works without a flaw. However... Im wanting to make it to where the audio increases to full volume (that i set, I believe that most of them I have closer to like .5 volume) and fade to a stop instead of just abruptly starting and stopping..... any thoughts?