Sonos App 5.0.11.
It is possible to play an mp3 clip via an URL even on older sonos players.
There is an option to use soundboard but only for the new range of sonos player.
Isn`t it possible to modify soundboard to reach the audio clips via an URL. This would make it possible to use older Sonos players with soundboard.
Second option :
make ist possible to store a sound file on homey directly to use the URL path in the sonos app.