Elsewhere's Roof

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Elsewhere's Roof controls mechanical percussion devices by using
dripping water as a signal source.  It stands ten feet tall and has five
channels.  Each channel starts with a laboratory burette and a valve
that controls its drip rate.  When a droplet of water lands in a mason
jar below, it is captured as a signal.  As a "drum machine," ER is
peculiar because its five channels are unaffiliated with each other.
Rather than the subdivisions of a common meter that govern a
conventional drum machine, the channels of ER are infinitely variable
and independent.  The result is complicated phasing rhythms that human
performers can't, and machines rarely do.