4 ms·My friend patented an Acoustic Drum Expansion and is trying to mass produce it4 points by _Marak_ 10y agoeb0la 10y agoI can't imagine what a good death metal drummer can do with this Drum Expansion. Looks fun to play :-)_Marak_ 10y agoI got to play with a few different versions of it. It's super fun to play. Was able to get some fairly complex rhythms going and I'm pretty terrible at the drums.