I'm not really clear what you are asking. The technology of HiFi and that of recording are essentially the same thing.
Usually, when recording, the engineer will only set the panning to the foldback or monitor mix. The panning for the final recording is usually done at the mix-down stage, so the producer and engineer (and sometimes the band) will decide only at that point exactly where on the "sound stage" they want each instrument to be placed.
If you mean that you don't understand what panning is, it just means sending more of the instrument to one channel of the stereo mix than the other. So if you want the bass to appear slightly left of centre stage, you send (say) 60% of the originally recorded bass track to the left channel of the stereo mix , and 40% to the right.
It's just like the balance control on a HiFi, except that at this stage in the process, you can control each of the separately recorded tracks individually.