Soon, these two modes blend. Sounds seem at one moment random and the next urgently significant (Track 1D 2:23–3:20). This urgency takes firm, narrative hold for a minute as bass objects crack like gun shots and mount to an alarming volume in the company of rattling treble, but it diffuses just as suddenly when they die off (Track 1E 3:21–4:15). After a few seconds of near-quiet, a double beat of bass drums advances. It reaches a pace like an adrenaline-fueled heartbeat and then ceases (Track 1F 4:16–5:25). An indeterminate, open period follows. Muffled stretches bring to the fore sounds of pigeons flying in and out of the ruin, but a moment later the corridor fills again with indomitable tapping (Track 1G 5:26–6:20). Discrete, repetitive knocks morph gradually into more grooving rhythms, overlapping as they build a dance beat (Track 1H 6:21–7:06). Suddenly, the dance theme is undeniable (6:33). As Cardiff described, “it feels like you’re in a rave, like dance music, like boom-chicka-boom.”  This brief, exuberant interlude, teases the percipient then concludes abruptly with four rounds of rhythmic pounding (6:55–7:06).
Methodical ticking ushers in a resonant, repetitive gong like a clock tower counting the hour 24 times (Track 1I 7:07–9:20). Midway through, its timbre transmutes into a low rumbling, and its rhythm slows to an elegiac crawl. After a long silence, a low, clattering glissando rolls up and down the cellblock like batons dragged across bars then beat against an arsenal of timpani (Track 1J 9:21–10:10). An open, transitional period follows, this time featuring indeterminate noises that grow threateningly loud and seem to congregate (Track 1K 10:11–11:20). An eight-beat treble striker counts off, like a conductor or click-track, slowly at first and then once more at twice the speed, initiating a raucous, extended reprise of the ebullient dance theme (Track 1L 11:21–13:54). The dance beat rolls up and down the block in a second glissando, dissipating into ambient noise. Repetitive, unison blows fill the space and accelerate into Pandemonium’s climax (Track 1M 13:55–15:49), which sounds ultimately like a riot fueled by the libidinal release of the dance. Dance beat and militant noises engage one another in a master-level call-and-response before sounding a double beat and coming to an end. Charged silence follows (Track 1N 15:50–16:02) until the tapped exchange signals another loop. 
The cellblock announces itself as a totalizing visual experience, but Pandemonium coaxed visitors to look about themselves differently, in more localized ways, as they tracked the sources of these sounds. This iterative process of looking called into question the efficacy of the penitentiary’s visual schema in real lived experience, concentrating its possible nuances and uneven qualities. As Torchia observed, “Visual access to the cells is limited. Those on the second floor are completely out of reach and those on the ground floor are unusually dim.”  The grandeur and scale of the space solidified its impression of stillness, unperturbed by whatever was causing the sounds yet the sounds themselves exposed the falseness of this impression.  In her review of Pandemonium for Art in America, Carol Diehl corroborated a tension between the immediacy of the sounds and fact that they emanated from “unobtrusive,” “hidden,” and “unseen” sources.  In spite of its sublime reserve, the building itself was producing these noises, displacing its intended flows of power away from the singular center toward a plethora of actors emitting trajectories of sound in every direction.
Black cords “trailing out of all the cells on both floors” compelled visitors to “walk down the corridor to investigate” the source of these sounds.  The live quality of the sound was apparent, and percipients soon caught their makers in action. A single robotic ‘beater’ stood in each cell, snug to its object. Each robot had a distinct visual character, comprising an armature of varying height such as a microphone stand or metal bucket rigged to a wooden drumstick or pedal, Plexiglas wand, metal screw, or felt-wrapped mallet. These strikers were controlled by PianoDisc solenoids, little motors used in player pianos. The thin black cords snaking out of the cells wired the solenoids to a MIDI (Musical Instrument Digital Interface) system with two computer-controlled, pressure-sensitive keyboards. Thick bundles of cable converged on one upstairs cell, revealing the presence of this central system there. Sinuous, rubber tubes spilled over the threshold with a menacing, organic character, like the tentacles of some nesting, alien man o’ war.  At the same time, their obvious electronic function suggested artificial intelligence, a DJ booth, or central command on a submarine or spacecraft. The robotic beaters were similarly evocative hybrids. They comprised disparate prefabricated materials, industriously screwed together to perform their singular functions. Posted one to a cell, these automatons became semi-anthropomorphic presences, their appendages thwacking objects with apparent deliberation.
Keyboards controlled each side of the aisle. They were wired so that each key sent electrical energy to a single solenoid, which converted it into magnetic force of a predefined pressure along a gradient. The pressure flipped a mechanical switch that pushed the striker into action to make contact with its object with a tap, bang, or crash depending on its setting.
As Miller explained:
As Miller explained:
It’s a mechanical thing. Every sound you hear is an acoustically produced sound, no speakers. A computer controls all these, we call them ‘beaters,’ that hit different things in each cell. And the way we composed it was that we had two keyboards connected to the system and every key was for a different room. 
Miller inventoried objects and charted their relative pitches. He added steel drums tactically to a dozen spaces to increase possible volume. His notes translated into a coding system for the keyboards that made legible their connections with the beaters. With Tonmeister Titus Maderlechner, the artists composed the sequence for the beaters to perform together and programmed it on a loop. 
Pandemonium’s noise multiplied and metamorphosed in dialogue with both the architecture of the cellblock and the bodies of its visitors. Drawn in by suggestions of a ghost story, percipients found themselves instead in the company of robots. Though clearly functional objects, the beaters were uncanny in their own way, seeming individually incommensurate with the force and tenacity of their collective output. They caused mute objects suddenly to resonate, and those vibrations traveled up and down, back and forth through the volume of atmosphere contained in the corridor until deflected by a wall or channeled beyond the block. With hard, angular surfaces, the acoustic environment was bright but also modulated with the fuzzier sounding-boards of visitor bodies, curving vaults, and moist dust piles.  Glissandi occur twice in Pandemonium, and in those moments, “every object in every cell [seemed] to be struck in quick succession up and down the block . . . like an x-ray passing through whatever and whomever stands in its way.”  Pandemonium offered a remarkably visceral experience of this environment, bringing visitors bodies into intimate contact with a building and world of things that could otherwise feel remote.