footswitch

good morning
i have this foot switch
http://www.banggood.com/Wholesale-USB-Foot-Switch-Pedal-Switch-For-PC-C…
(it's an USB keyboard emulator and you can change programmatically the desired key)

i would like this to start playing inside Musescore Songbook with this pedal

In the desktop version the "space" key start the song but with a complete keyboard attached to tablet i have only the key Pg Up /Pg Down, Arrow Left/Right working (changing the score page)...in Songbook i can't find a key associated with the play button

can you help me???

thanks Luca