There are a lot of minor characters in HPMoR, and I generally have a hard time keeping their voices distinct in my mind. Thus, for a few of them I’ve used very exaggerated distinct voices. This helps me remember who sounds like what, helps differentiate the characters when there’s just one person voicing them all, and is a lot more fun for me. (OK, I’ll admit it, the fact that it’s fun for me is probably the main reason I do it) For Ron I chose Keanu Reeves ala Point Break. The somewhat-dim surfer guy that only talked from the back of his throat seemed perfect, and I often start Ron lines with a warm-up of “Woah! Via con dios.” (I have stock phrases for most characters that I repeat when I need to get in-voice)
I find the Platform 9 & 3/4ths ambient sounds very soothing, I could listen to it all day. Unfortunately I’ve lost the links to the original sound files, so I cannot properly credit them. :/ I think the primary track was an outdoor market somewhere in Germany, with the train sounds overlaid.