Question: OpenMSX - Autofire

I realize this thread is already a year old, but it is the first hit at DuckDuckGo.

Anyway. The openMSX manual isn't clear on how to use -repeat to autofire a joystick button. I understand I have to use bind with an event and a command. So, something like

bind "joy1 button1 down" type "hello"

will output hello to my screen. But what would be the command to fire button 1 on joystick 1? I tried typing a space, but that results in "warning: Error executing hot key command: Syntax error"