A picture is worth a thousand words. Here are some photos of a soft flame at three different pressure settings and one picture showing a big flame on higher tank pressures - what limits the upper end.
The torch in the photos is a GTT Lynx (handtorch). The diameter of the face is 3/8". I have labeled the regulator pressure settings on each photo.
As you can see, you can get a very similar flame, regardless of the regulator pressure settings. The needle valves control the gas going into the torch.