What might these frequencies be?

I extracted the low end from several layers and put into the bass track that was lacking much.
I wonder what these other frequencies are. I hear nothing when that area is highlighted during playback.

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Perhaps high frequency background noise, hiss or dithering artifacts, or simply a component of the original sound. IMO not unusual.

What kind of bass are you referring to? Bass guitar, acoustic bass, bass synth or something else?

P.S. As I’m sure you already know, when a sound is referred to as bass it doesn’t mean there will only be bass frequencies included in the signal. And, of course, if the higher frequencies are not needed, you can simply filter them out.

This was bass guitar. I am just trying to get as much bass as I can on one layer and cut the lowest part from several layers to get most of it. My goal was to try to then correct the timing errors that marred an otherwise good performance, but I am finding it very hard to make progress, as detailed more in another post about how the layers have more or fewer measures than the original.