I won't mince words:

This build MASSIVELY improves netplay.

I also fixed the volume options not working properly.

Here is a small amount of text:

• Addressed the issue of the game dropping frames after a rollback, which also greatly improves netplay responsiveness and reduces dropped inputs. [spoiler]It had nothing to do with rollbacks themselves being slow, and everything to do with me not knowing how to write frameskip code. :^P[/spoiler]
• Addressed how sounds are handled during rollbacks!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I'm not done! There are still occasional dropped sounds, but this is the lion's share of fixing the problem.
• Fixed the problem of weird hitches while playing a long set on Random stages, from the previous build.
• Fixed the music restarting when staying on the same stage if there was a rollback to frame zero. :^P
• Fixed the fact that some sounds didn't listen to your options volume settings. OOPS.

Linux and MacOS notes:

• Good: The sound code also got a big upgrade and is now using Ethan Lee's FAudio library!
• Not-as-good: Unfortunately, for platform support reasons 32bit support on MacOS is a thing of the past...so it is no longer possible for us to continue 32bit support for future Mac builds. :^(

key Features:

• Classic six-button play gives each character a huge variety of attacks and special moves
  
• Variable Tag Battle system allows players to pit different size teams of one, two or three characters against one another
  
• Custom Assists let you outfit your team with a huge variety of attacks for nearly endless strategic possibilities
  
• A Robust Anti-Infinite Combo system keeps competitive play free of abusive tactics

• OS: Ubuntu 15.04 / Fedora 22 / SteamOS
• Processor: Dual-core CPUMemory: 2 GB RAM
• Memory: 2 GB RAM
• Graphics: Intel HD3000*Network: Broadband Internet connection
• Storage: 14 GB available spaceAdditional Notes: *MESA drivers 1.6.0 and 1.6.1 are not supported. please update to 1.6.2.