Use your keyboard to play on the drums
Apple has turned off motion sensor in Safari by default.
Use Chrome/Firefox or go to Settings > Safari >
Motion & Orientation and turn it on and reload page
to be able to use the virtual drums.
Open this section on an iPhone to play virtual drums with your phone
Shortcut: onemotion.com/dm
PS. If you upload a video playing with your phone on Youtube
tagged with onemotion I will put it here.