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Mono audio, for anyone who hears with one ear. A new row in the TortOS menu, Audio Channels, right under Audio Output, on the Brick and the Pixel 2. mono plays the two channels as one in both ears, so nothing a game or a song puts on one side alone is lost. mono left and mono right play that same sound in one ear only, on headphones, a Bluetooth headset or the Pixel 2's USB-C adapter. On the speaker they play as mono, since a speaker isn't on one ear. stereo is how it's always been, and where it starts. It works in games and in Muse, changes without a click, even mid-song, and is kept through a restart.
Updating from an earlier version
With the TortOS Installer, choose Update. By hand on the Brick, copy the zip's TortOS/, .tmp_update/ and trimui/ over the card's, replacing what is there. Copying the zip's Roms/, Saves/ or Bios/ over the card's replaces them, games and saves included. On the Pixel 2 the installer is the only way that keeps the games: writing the image by hand erases the card.
New install
With the TortOS Installer, choose the device and Fresh install. By hand, as in the README: the Brick uses TortOS-v1.6.0.zip, the Pixel 2 TortOS-v1.6.0-pixel2.img.xz. TortOS-v1.6.0-pixel2-sources.tar holds the source of the open-source software in the Pixel 2 image, and SHA256SUMS the checksums of all three files.
If I had a nickel for every time I said, "what?" to my wife, I'd have well over $100 and a strange way of making money. It's funny how things right in front of us are so easily missed sometimes. This one is for you, u/Inner-Comfort-5225.