Here are a few videos to help with the TDI sl ...
TDI sl help with tones https://www.youtube.com/watch?v=ZG5jqXYo6b4
TDI sl Gain settings https://www.youtube.com/watch?v=yHSO29WUrlE
TDI sl pinpointing tips https://www.youtube.com/watch?v=ghxASe3pkqQ