Concord

You don’t need to put it in the gear opposite to the direction it’ll roll. Generally you want to put it in the gear with the lowest ratio (which in my car I think is first), as that will require the most amount of force to turn the engine. But also some engines shouldn’t be rotated backwards because that might damage them. So that would mean put it in first facing downhill or reverse facing uphill.

What does ctrl do on its own?

An LGBT?

Interesting, fair enough, that makes sense. So your receiver was getting a 5.1 signal, but it really did just ignore half the channels when you set it to output 2.1.

That’s not the problem I think most people here are complaining about though, which is sound mixing / dynamic range / editing making speech too quiet, rather than having the wrong settings.

I don’t think missing channels get muted, they just get shared into what’s available. A 5.1 soundtrack played on a 2.1 system is going to share Centre between L and R, and put SL onto L and SR onto R. I have an old surround sound system that can’t decode the new codecs that Disney plus etc use, but the Chromecast knows this so just sends it out a 2 channel boring signal. Dialogue is fine because it just goes to the two speakers equally, rather than be cut out. If your system is set up to output to 5.1 speakers but you just haven’t plugged in the centre speaker, then that’s a different thing and you would miss stuff, same as if you didn’t plug in the front left speaker.

I think the atmosphere can increase in volume when it gets warm because it’s not a proper closed system, so the pressure doesn’t go up in the same way.

The radioactive source isn’t used for power in smoke detectors, it’s used to detect smoke. What small scale devices use radioactivity actually for power?