Activate the sustain pedal

You can hold down the space bar on your keyboard and the sustain pedal will be activated.

If you have a game controller, you can use it to control the sustain pedal. Go to the settings page and set the desired button numbers. To obtain the key number, you can use the Gamepad Tester website.

Here’s a video of me using a Dualshock controller as a sustain pedal.

You can use the iPedal instrument to control the sustain pedal with a touchscreen.