I'll admit I was a little skeptical at first. I didn't think its approach to lipsync approximation would be comparable to traditional phoneme-based animation. But it does a fantastic job, and it's much easier to add voiceover to your game. If you're considering adding voiceover, or even just eye focus and facial expressions, look into SALSA. -Pixel Crushers

Dialogue System adds support for SALSA LipSync Suite in version 2.1.8!

Pixel Crushers have built fantastic integration for SALSA LipSync Suite into their v2.1.8 release of Dialogue System for Unity. Read their blog post about this release.

If you check out the product page of their awesome asset, you'll notice that it's garnered much praise and lots of (★★★★★) ratings! As you can imagine, we're super excited about the integrated support in Dialogue System for Unity. It's an awesome pairing of assets that give indie projects a AAA feel.

You can grab it from the Pixel Crushers extras page, and check out the interum documentation here.

Simple Automated Lip Sync Approximation
~ We look forward to seeing what you create! ~