Control Resonant Soundtrack Hides Morse Code Easter Eggs, Says Composer

What did the Control Resonant composer say about hidden easter eggs?

Composer Petri Alanko confirmed the Control Resonant soundtrack contains deliberate audio easter eggs, including a rhythm that spells 'BEWARE' in Morse code. He said some hidden details may take fans seven or eight years to discover, and that he enjoys hiding nods and winks throughout his music.

In an interview with TechRadar Gaming, Alanko explained that he likes to 'go to extremes to add depth to everything.' Not all of that depth is meant to be heard on a first playthrough; some of it is subliminal, and some sits just beneath the surface for anyone willing to dig into his project files.

He described receiving emails from listeners years after release, when they suddenly realise a certain sound's rhythm was actually Morse code. That delayed discovery is, for Alanko, the most beautiful part of the process.

The composer also stressed that the soundtrack is not a puzzle to solve. 'Nothing is obvious and nothing is rubbed into your face,' he said, adding that it is ultimately 'only music made with love and enthusiasm.'

How does each Resonant enemy sound in the Control Resonant soundtrack?

Alanko gave each Resonant enemy its own features in the concept track. Hedron uses clangorous, metallic, sequenced and constantly moving sounds, Hiss pushes pitches all over the place to feel corruptive, and Mold turns everything into a triumphant sonic goo of dispersers.

The enemy design was not only visual. Alanko built distinct musical identities for each Resonant, so the concept track itself carries information about how each entity behaves.

Hedron's sound is rhythmic and mechanical, matching its patterned presence. Hiss is deliberately unstable, with pitches drifting to suggest corruption. Mold is described as a spectacle of dispersers that turns everything into 'sonic goo.'

These choices mean the soundtrack can be picked apart by attentive listeners, but they also work as atmosphere for players who never notice the technical detail.

• Hedron: clangorous, metallic, sequenced, patterned, constantly moving
• Hiss: pitches start going all over the place to convey corruption
• Mold: a triumphant spectacle of dispersers turning everything into sonic goo

Why does Petri Alanko re-amp hardware synths through speakers?

Alanko re-amps hardware synths through a speaker setup and a pair of microphones to add organic texture. He learned the technique from articles about the late Conny Plank, the producer behind Kraftwerk and Ultravox, and applied it during the Control Resonant soundtrack.

Hardware synths are a big part of Alanko's arsenal, but he does not keep them purely digital. He routes them through speakers and captures the result with microphones, a process known as re-amping.

The approach adds room character and imperfection that a direct signal lacks. Alanko said he learned it by studying Plank's work on albums such as Die Mensch-Maschine, Computerwelt, Vienna and Rage In Eden.

He also mentioned a trick he has used 'about a million times': blending a string section's resin sound into another instrument so it resembles a stringed instrument. These layered details are part of why the soundtrack rewards close listening.

When will fans find the Control Resonant music secrets?

There is no set timeline. Alanko says some easter eggs may never surface, while others could take seven or eight years to be noticed. Discovery depends on fans digging into project files, isolating sounds, and recognising patterns such as Morse code.

The composer deliberately avoided making the secrets obvious. Some tricks are subliminal, while others sit slightly more at the forefront. That range means different listeners will find different things at different times.

Alanko's example of a fan email arriving years after release shows how long the tail can be. For a game soundtrack, that kind of longevity is unusual and suggests the music is designed to be revisited.

As of October 2026, no comprehensive list of hidden audio easter eggs has been published, so any fan discoveries remain community-driven.

Bottom line

Petri Alanko has confirmed that the Control Resonant soundtrack is full of hidden layers, from Morse code rhythms to enemy-specific sound design. Some of these secrets may take years to find. If you play the game, keep the soundtrack on and listen closely — the next discovery might be yours.