Update: I have used the verify integrity function in the launcher and then restarted the launcher. Shortly after restarting it began to redownload today’s 1 GB patch. After it finished, I launched the client and the sound was working. I restarted the sound a couple to make sure it wouldn’t crash and all seems to be working now.
My guess would be that something in the downloaded files got corrupted the first time I downloaded the patch shortly after downtime. I live in a small rural town with pretty abysmal internet and have been having regular DCs from my ISP, so I wouldn’t be at all surprised if a dc happened when it was downloading the patch. (Century Link is so horrible and they have a complete monopoly in my area)