Hi David,
Yeah of course 
At least Iāll try! 
My understanding was that Original Sound was first introduced by Zoom to help ācorporateā users (like us at my university) who have more complex AV setups that send an already processed audio signal to Zoom so didnāt want Zoom to then also process that signal, which may reduce the quality. Thankfully this option also helps us musicians as well. They then went further to help us by adding High Fidelity Music mode a few years back which aims to optimise the quality of music/instruments (rather than voice) being sent over Zoom. The trade off is that it uses more CPU processing and data, but unless you have slow PC &/or a poor quality connection, you shouldnāt experience too many issues with that.
I covered the echo cancellation subject in more detail in another thread here, but to summarise, if you arenāt wearing headphones, then you should have it enabled or at least toggle it on and off (or constantly mute & unmute), otherwise youāll cause echo for others when they speak and you still have your mic open. If you are wearing headphones, then it could still be worthwhile as I suspect it does add some adjustments to help normalise your audio with others which may help out those that are too quiet. But if youāre concerned that it colours your sound (although thatās not something Iāve noticed from my testing), then have it off, but wear headphones.
Nothing is set in concrete though, as each personās setup is likely different, so your best idea is to test with (ideally) two others in a meeting, so levels can balanced evenly between all three parties, instead of a 1-1 test, which can be misleading at times (unless someone has a known good level theyāre working too).
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