Mike Thornton:”When I first started in recording studios, one of the responsibilities of the gopher/runner was being the tape op. Your job was to be in charge of the tape machine, and if the engineer or producer asked to hear the second chorus, you knew where it was, and could cue the tape machine up to the right point in seconds. If you couldn’t, then there was no shortage of other people who were ready and willing to take your place.
Although the industry has changed, there is still the need to navigate quickly and efficiently round a Pro Tools session, and the key to this is Memory Locations. You can use the Memory Locations window, as well as the Markers Timeline to set and recall these, but as with most things in Pro Tools, there’s a logical shortcut system we can use instead (to get the most of these, you’ll need a keyboard with numeric keypad):
Source: Pro tools expert