fixes #1114 -- clear interval ID on restart
fixes #1114 -- clear interval ID on restart

walterbender/musicblocks,eohomegrownapps/musicblocks,eohomegrownapps/musicblocks,walterbender/musicblocks,eohomegrownapps/musicblocks,Hrishi1999/musicblocks,walterbender/musicblocks,Hrishi1999/musicblocks,Hrishi1999/musicblocks