Navigate to the mix window of your pro tools session. You can get there using the quick key "Ctrl" and "=." This will swap between Pro Tool's two main views, the mix and edit windows.
Locate the vocal track to which you would like to add a delay.
Press the small box next to the first empty "aux send" on the vocal track. This will open a drop-down menu for you to select which aux send you would like to use.
Choose the aux send to which you would like the audio to be routed. For example, choose aux send "1." An aux channel strip will pop up on the screen.
Drag the channel fader on the aux channel strip up to "0." This volume setting is also referred to as "unity" gain, where no volume is being added or removed from the signal. The vocal track is now being sent out on auxiliary bus 1.
Create a new aux track in your Pro Tools session with the quick key "Shift+Ctrl+N." When the program asks you which type of track you would like to create, choose "aux master."
Locate the new aux track in your mixer window. Press the small box next to the first empty insert slot on the track. The insert section of a track is displayed at the very top of the window.
Choose the plug-in that you would like to assign to the track. To add a delay to the vocals, choose the "Digidesign Delay" plug-in that comes with all Pro Tools systems.
Locate the input section of the aux delay track. This section is located just below the aux send section of the track.
Press the input box to change the current input selection. Choose "aux 1" as the input for the auxiliary delay track.
Press the space bar to begin playing the track. Slowly raise the volume fader on the auxiliary delay track to begin hearing the delayed vocals. Your original vocal track is unaffected and dry, while the delay effect is controlled on the auxiliary delay track. You can apply more effects to the auxiliary delay track or add compression to the delay effect.