I made a theremin using the instructions on raspberrypi.org. I want to be able to use this as a real instrument i.e. I only need to power on the Pi and everything will work without using a screen and a keyboard to click play after opening Sonic Pi.
I'm aware that Sonic Pi is a GUI application, so it will need the desktop to be up and running, but with autologin I don't think it's a problem. I know how to autostart the Python script and Sonic Pi, but I don't know how to make Sonic Pi to play the necessary buffer after autostarting.