У вашего броузера проблема в совместимости с HTML5
Redstone and Piston 32 step 5 Track Looping Machine.
Used Pistons to "mute" Note Blocks resulting in a compact design allowing note blocks to be placed next to each other without spaces. This design enables a 32 step (2 measures/bars of 16th notes) in a reasonable space.
Rebuilt to work in Minecraft 1.4.x
Download: http://www.ocddisco.com/2011/07/minecraft-5-channel-music-sequencer/
OCD texture pack: http://www.ocddisco.com/ocdpack/
Website: http://www.ocddisco.com/
Twitter: http://twitter.com/ocddisco
Facebook: http://facebook.com/fvdisco
Twitch: http://twitch.tv/fvdisco