If the tempo for a song seems too fast, try to play it in Conductor Mode in a slower tempo without the background band. Conductor Mode is also good for rehearsing difficult passages slowly.
When performing with many iPads, only one of the iPads will be playing in the BlockPiano Game Mode as a “master” iPad. It is a good idea to amplify it slightly (if possible). All the other iPads in Conductor Mode follow the “master”.
In Conductor Mode, let the most confident player be the conductor. BlockPiano reflects real life: if the conductor fails, the whole band fails…
You can also try to play with all iPads in BlockPiano Game Mode but this needs a very precise tap on the play button on all iPads in order to get them synchronized. But try it; it is good practice for concentration and accuracy! It helps to bring the background volume down to zero for all but one iPad.