Hi, guys. I have a quick question... I'm pretty new to all of this, so please bear with me. Right now, I'm encoding a bunch of (older) TV show rips that are either in mono or stereo sound. Mainly stuff from the '70s and '80s... no surround sound. When using Handbrake, my first audio track is always AAC. Is there any reason to include AC3 passthru as a second track? I want to make these MP4s as future-proof as possible, but at the same time, if it's not needed, I don't see the point in wasting hard drive space. Thanks for any input.