Sima makes a Volume Stabilizer. Smarthome.com sells it for $69.95 but if your devices are each going independantly thru your A/V receiver then there's no easy way to integrate it. Sima also makes a nice 4in/2out A/V switcher with audio stabilization built in. I have one, but haven't been able to use the Audio features since my audio goes thru my receiver. I kinda wish I'd found this switcher first, since at $150ish it would have done most of what my receiver does for 1/4 the price. Oh well.