I am trying to mix audio in 5.1 surround sound in Sony Vegas. Everything is working as it should until I turn on "Automation Write (Touch)" and try to pan around the sound field. If I move the panning icon all the way to the front left speaker, I have levels coming from both the FL and FR speakers, when it should just be coming from the FL speaker alone. If I move to the rear left speaker, I get sound coming from the front left as well. Move to the RR and I have sound coming from all speakers (except maybe the center).

Is there a setting I have wrong? So you know, I have a surround sound card and a 5.1 speaker set-up. I have experienced this problem with Vegas versions 8, 9, and 10. I DO NOT have these issues when automation is off.