Pan

Pan places a sound between the left and right speaker. Center feeds both equally. Hard left feeds only the left. A mono synth panned left is still one sound, now sitting on the left.

Width is a separate control. Unison spread, a stereo enhancer, or Panorama change the relationship between left and right. Pan then chooses where that picture sits.

The channel pan and a device’s own pan both apply. If both are off center, they add, and the sound sits further to the side than either knob shows. Leave one of them centered unless you mean to combine them.

Bass is usually kept near the center. A low sound on one speaker disappears on a small speaker and pulls the mix with it. Hats and other short percussion can sit further out. Pan on a reverb return matters too: matching the source keeps the room attached to the instrument, and leaving the return centered puts the instrument in a shared room.