Can I use MIDIcreator switches with Ensemble?

Yes, although you will have to plug them into variable sensor sockets.

3.5mm headphone adaptorMIDIcreator uses stereo jack plugs for switches and sensors, meaning that they can’t be plugged directly into switch sockets on the Ensemble16, Hub or Connect. Use a 3.5mm to 1/4″ stereo headphone adaptor to make the plug the right size.