The start button needs to have instant "your song is starting now" feedback (there is a 1-second delay to ensure the tablet and projector are in-sync before starting). People think the button didn't do anything, so they press it again, which creates another 1-second delay, so they press it again...
The start button needs to have instant "your song is starting now" feedback (there is a 1-second delay to ensure the tablet and projector are in-sync before starting). People think the button didn't do anything, so they press it again, which creates another 1-second delay, so they press it again...