In the framework of a presentation for the annual meeting of the GITEC association (held on-line in 2020 due to the CoVid-19 pandemic), a presentation focused on the Leslie speaker and its use for guitar. It is a kind of primer and gives an overview on the topic. The presentation included a number of examples to demonstrate the effect a Leslie has when used with guitar. These examples can be found here. Also included is a list of information sources on the Leslie speaker.