As well as conventional track-based automation, Samplitude Pro X has a sophisticated Object automation system.
Track automation is enabled by default, although it can be switched off. To confirm that it is enabled, go to the Track Editor Automation section and make sure that ‘Show’ is ticked. You can access all track automation parameters from the Track Editor in the area under the automation header. Click the arrow on the left of the header if it’s not showing. Right-clicking on the Rd [Read], Effect and Parameter elements will open a contextual menu, and it’s worth spending some time getting familiar with this menu.

The Aux Send automation pane. Aux 1 is active, as is the Aux Enable button.
The Aux Send automation pane. Aux 1 is active, as is the Aux Enable button.
Volume and pan automation can be enabled directly from the track header by clicking on the square ‘vol’ or ‘pan’ buttons to the left of the horizontal faders; you can also right-click on the ‘vol’ button to access the automation parameters contextual menu. When volume automation is enabled, a yellow automation curve or envelope will be overlaid on the track for the entire length of the project, reflecting the current position of the track volume fader. Moving this fader will adjust the volume automation curve to match. When pan automation is enabled, a light-blue automation curve will be overlaid on the track. Adjusting the horizontal pan fader of the track header or the pan pot in the Track Editor will adjust this curve accordingly.