Which one should I use?

[Billy832]

OK I got RockNmayhem's globe liner bought! Can't wait to see it! However, I already have my own plans ...looking at the paint job he did, if it looks as good in person, not touching it. The truck has no sound or lights, so we gotta fix that. I was planning on using my futaba 4 channel if I can. I know I can't if I go with an mfu, but I've been seeing a few videos of servonaut units and I like the sound. I know they are German, where I. The USA can I get them? Can I use a 4 channel or do I need more channels? Thanks fellas....