Exactly what it says in the title. Valve updated the audio codecs in most games to OPUS instead of the previously used CELT. What this means is SLAM will no longer work as intended. What SLAM has been doing when you attempt to play music is turning your normal microphone on and playing it back as an echo, so every cough, breath, or chewing sound you make will be picked up and played back to yourself instead. This is also not a recent problem, either. Jungle Inferno for Team Fortress 2 dropped back in October. We are now going three months in TF2 with the OPUS voice and audio codecs, and SLAM's dev team has done nothing in that time period to remedy the situation. For all intents and purposes, we should consider SLAM as a dead program now.

The Devs for SLAM obviously don't care that there's a bug in the program they put out. Otherwise, one would think they would have rushed out a new version for people to use that works with the new audio codecs Valve updated everything to use.