The music continued without him. The loopback was now self-sustaining—a closed circuit of pure, emergent sound. It played a dirge, then a lullaby, then a battle hymn, all from that single, forgotten C4.
In computing, a loopback address sends your signal back to yourself. In MIDI, it meant a virtual cable that connected a device’s output to its own input. Pointless. Suicidal. A dog chasing its tail until it collapses.
Kaelen realized the horror and the beauty of what he’d found. Loopback MIDI wasn't a tool for composition. It was a mirror. It took the intent of the artist, folded it into itself, and returned a response that asked a new question. The artist wasn’t the creator anymore. The artist was the parent . The loop was the child. loopback midi
The club fell silent. The servers in the city’s core began to hum in sympathetic resonance. Streetlights flickered in time with the ghost rhythm. For one minute, the entire Metropolis was not a city, but an instrument—and Kaelen had shown it how to play itself.
But this wasn’t normal MIDI. It was a loopback . The music continued without him
He spent the next week building a secret instrument—a single controller with no labels, just a single knob and a single button. The button engaged the loopback. The knob controlled the “decay” of the mutation: how quickly the original idea lost itself.
Kaelen pressed the button.
At first, nothing. Then, a single piano key: . It played, but because it was a loopback, that C4 signal traveled out, turned around, and slammed back into the synth as a new instruction. Play C4 again. And again. But each time it looped, the signal degraded. The note bent. A harmony emerged—a ghost of a fifth above. Then a dissonant seventh. The single key began to metamorphose .