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and just watched a video that said basically we must always used dither when going down in bit rate...
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Bit
depth* (from floating-point or 24-bits or 16-bit, etc.).
That's theoretically true and it's good rule, but generally you can't hear dither (or the effects of dither) at 16-bits or better (in a proper-scientific blind ABX listening test).
Dither is VERY low-level noise. So usually you can't hear it and it's often masked by louder "analog" noise (if you recorded from a microphone or other analog source). And if you have analog noise it's already dithered.
I wouldn't loose a lot of sleep over it. Focus on getting a good recording of a good performance, and then on stuff you CAN clearly hear like mixing and effects like EQ & reverb, etc.
* Bit
rate (kbps = kilobits per second) is related to file size and it's often used as a rough indication of quality with lossy compression. (A 256kbps MP3 usually sounds better than a 64kbps MP3.)