If you own an AV receiver made by Pioneer, Elite, Onkyo, or Integra, you may soon get a big software update. Premium Audio Company (PAC), the company that owns all four audio brands, says that on October 28, it began rolling out new software for 19 different AV receivers that contains playback improvements for Amazon Music and Tidal, as well as enhancements to Dirac room-tuning features on supported devices. Many models will also be updated to the latest Google Cast 2.0 platform (previously known as Chromecast). While owners of some…