On p. 12 of Reference Manual I found another good option - Synchro Stop Window:
„When the [SYNC STOP] button is turned on and this is set to a value other than “Off,”
the Synchro Stop function is automatically cancelled if you hold a chord for longer than the time set
here. This conveniently resets Style playback control to normal, letting you release the keys and
still have the Style play. In other words, if you release the keys more quickly than the time set here,
the Synchro Stop function works.“
So if you set it to 1/8 or 1/16, when tapping any key, the whole accompaniment including drums
and percussion stops until you play another chord.