All MIDI keyboards work with Soundtrap on Mac, Windows and Chromebook. If your keyboard has a USB MIDI output, you can connect it directly to your computer.
For keyboards using 5-pin MIDI connectors, you'll need a separate MIDI interface to connect it to your computer.
For MIDI controllers such as electronic drum kits or push tablets, Soundtrap's note mapping may not correspond with your controller's mapping. It's currently not possible to customize note mapping.