To speed up or slow down the media, do one of the following.
Either:
1. Click on the menu button of the player (visible as 3 dots in upper right corner).
2. Select the submenu Playback speed.
3. Choose a playback speed.
or:
1. Select Options:Preferences in the main menu.
2. Select the Player tab in the preferences window.
3. Choose a value for playback speed.
You can also use/create keyboard shortcuts to control different playback speeds.