I've been playing with that myself, probably should be 0. I was going for what gives me the best signal on my S9s. The possible values seem to be 0, 1 and 2, but I'm still fuzzy on the differences. And none of them force Audible to play in both ears for the mono signal rather than just the left. In truth, since my new job doesn't allow Bluetooth signals on site, I've mostly moved back to a wired headset anyway.
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