There is something wonderfully unsettling about the Ondes Martenot, an electronic instrument whose gliding tones can sound like a human voice remembering a language it never learned. Created by Maurice Martenot in 1928, it emerged from an era when electricity still carried the promise of genuinely alien musical possibilities. Nearly a century later, it remains capable of making the familiar world seem faintly supernatural. On "Nebulage", Nathalie Forget and Gilles Aubry put this peculiar instrument into conversation with its own digital double, creating six improvisations in which physical performance and computer modelling continually blur the distinction between an original and its imitation. The result is a shifting, occasionally disquieting sound world in which electronic signals seem to acquire their own forms of life, as if the machinery had begun dreaming while its operators were briefly distracted.
The duo's name, Kr-Krr, already suggests a small collision between language and noise: a syllable trying to emerge from static, perhaps, or a frog with an unfortunate electrical problem. That impression fits the music rather well. Forget plays the Ondes Martenot, while Aubry works with computer and modular synthesizer, using a virtual reconstruction of the instrument developed through physical modelling in Max/MSP. The software can reproduce aspects of the Ondes' characteristic sound while also stretching its possibilities beyond the behaviour of the physical instrument. The two performers therefore share a common sonic vocabulary without necessarily speaking the same dialect. One works through the tactile decisions of a player; the other can manipulate the instrument's electronic identity at a more fundamental level.
Forget is exceptionally well placed to explore this relationship. A leading exponent of the Ondes Martenot, she studied at the Conservatoire National Supérieur de Musique et de Danse de Paris, where she received its highest distinction for the instrument, and has performed with major orchestras and conductors across the international classical circuit. Her repertoire encompasses composers such as Olivier Messiaen, Edgar Varèse, Arthur Honegger and Tristan Murail, while her collaborations also extend into improvisation and rock, including work connected with Faust and Radiohead. Since 2016, she has taught the Ondes Martenot at the Paris Conservatoire. Aubry approaches the same territory from a different direction: a sound artist and musician associated with Berlin's noise collective MONNO, he works with field recordings, computer programming and electronic manipulation, across music, installation, film and radio. His broader practice is concerned with how sound acquires meaning through technology, environment and cultural context. Their meeting feels less like a stylistic compromise than a productive collision between two distinct ways of thinking electronically.
The opening "Acousmatic Frog" introduces an atmosphere in which the biological and the synthetic become difficult to separate. Its title suggests an animal heard without being seen, a useful description of music that invites the imagination to identify sources while withholding enough information to make identification unreliable. Chirps, wavering tones and unstable textures suggest a world populated by creatures whose anatomy might consist of sine waves and electrical components. The effect is playful without becoming whimsical, and eerie without resorting to the predictable vocabulary of horror sound design. There is no need for a soundtrack composer to add a sudden bass impact and announce that something terrible is approaching. The sounds themselves are strange enough, particularly when they appear to imitate one another without quite agreeing on the rules.
Then comes "Cross voltage", the album's twenty-two-minute centre of gravity. Its extended duration allows the duo to explore the tension between sustained tones and abrupt changes, between passages of near-stasis and sudden surges of activity. The Ondes Martenot's gliding pitches and expressive vibrato can suggest breath, vocalisation or the cry of an animal, but Aubry's digital counterpart unsettles these associations. A sound may appear to have a physical source, only to become more abstract as its electronic properties are altered. Conversely, an unfamiliar texture can acquire a curiously organic quality through the way it bends, trembles or interacts with another sound. The music repeatedly moves across this boundary, resisting the comfort of knowing whether one is listening to an instrument, an imitation or something that has emerged from the friction between them.
This is where "Nebulage" becomes more than a demonstration of the Ondes Martenot's distinctive timbre. The virtual instrument is not simply a convenient substitute for an expensive piece of historical equipment, and the physical instrument is not merely a nostalgic object being preserved for future generations of electronic-music enthusiasts. Their coexistence raises a more interesting question: how much of an instrument's identity resides in its material construction, and how much can survive transformation into software? A digital reconstruction can preserve recognisable features while opening new possibilities for distortion and control. Meanwhile, the physical instrument brings the irregularities of touch and performance, the small decisions that make a gesture feel immediate. Neither side has a monopoly on authenticity. The music gains its character from the uncertainty between them.
"Radio animal" shifts attention towards the suggestion of distant transmissions and biological calls. Its title evokes a creature communicating across an invisible network, or a radio receiver that has accidentally tuned into a form of life previously omitted from the scientific literature. Aubry's experience with sound processing and experimental electronics makes this territory particularly appropriate, while Forget's instrument provides an expressive counterweight to the more abstract electronic textures. Their interaction creates a sense of communication without a stable message. Sounds answer one another, overlap and break apart, but the listener is left to imagine what, if anything, is being exchanged. This is music that encourages a little imaginative paranoia, though preferably the harmless kind involving extraterrestrial frogs rather than one's neighbours.
"Blissement" continues the album's exploration of unstable sonic identities. The music's improvisational character is important here: its developments feel discovered through interaction rather than imposed according to a predetermined dramatic plan. A delicate texture may persist long enough to establish an expectation, then be interrupted by a more jagged gesture that changes the perceived scale of the surrounding sound. These contrasts give the album a sense of movement without requiring conventional rhythmic propulsion. Listening becomes an exercise in following relationships as they form and dissolve, with the ear continually adjusting its sense of what belongs together.
On "Boreal Control", the language of systems and environments becomes particularly suggestive. The title might imply an attempt to manage an inhospitable landscape, perhaps through some remote scientific station where the equipment has begun reporting weather conditions that do not exist. The music's abstract, spatial character supports such imaginary narratives without insisting on any single interpretation. The sounds seem to inhabit a place with its own rules, although those rules remain difficult to establish. One of the album's strengths is that it can suggest an environment without reducing the listening experience to a sequence of cinematic illustrations. Its textures are evocative, but they retain enough independence to be heard as sound in its own right.
The closing "Microbells" provides a particularly meaningful conclusion through its engagement with Olivier Messiaen. The piece revisits the soaring melody associated with the Ondes Martenot in his "Quatuor pour la fin du temps" ("Quartet for the End of Time"), a work composed during the Second World War and premiered in a German prisoner-of-war camp in 1941. Messiaen's music gives the instrument a history that is inseparable from its capacity for extraordinary lyrical expression. In Kr-Krr's hands, that melodic inheritance emerges through a more diffuse electronic atmosphere, suspended between recognition and transformation. The melody retains its emotional resonance, yet its surroundings make it feel as though it has travelled a considerable distance from its original setting. What was once a distinctly human gesture now appears to arrive through a medium whose origins and destination are uncertain.
This final encounter with Messiaen also gives the album's technological experiment a broader historical dimension. The Ondes Martenot was once a symbol of modernity, an instrument capable of extending musical expression beyond the limitations of conventional acoustic design. Today, its virtual reconstruction allows the same sonic vocabulary to be re-examined through a different set of possibilities. The future has not simply replaced the past; it has returned to it, borrowed its voice and altered its accent. The closing tribute captures that circular movement particularly well, making the old melody feel both remembered and newly unfamiliar.
There are moments when the album's abstract language may test listeners who prefer more clearly articulated musical structures. The long middle piece, in particular, demands patience, and the movement between delicacy and jagged activity does not always provide an obvious narrative thread. Yet the absence of conventional signposts is central to the experience. "Nebulage" asks the listener to attend to changes in texture, timbre and perceived source, rather than wait for a melody or beat to explain what should happen next. It rewards curiosity more than passive absorption, although it can also be enjoyed as an unusually vivid collection of electronic apparitions.
Released by Sirr Records, "Nebulage" is a compelling debut for Kr-Krr because its central idea generates genuine musical consequences. The dialogue between the physical Ondes Martenot and its digital reconstruction creates uncertainty, but also a surprising degree of expressive freedom. Forget and Aubry do not merely place two technologies side by side; they explore what becomes possible when each changes the way the other is heard. The resulting music occupies a shifting territory between instrumental performance, electroacoustic improvisation and electronic abstraction, with occasional flashes of lyrical beauty emerging from its more unsettling passages.
Ultimately, "Nebulage" leaves the impression of a communication system that has developed an independent imagination. Its signals seem to contain traces of voices, animals and distant environments, although none can be confidently identified. The Ondes Martenot breathes, the software answers, and somewhere between them a third presence begins to take shape. Whether this is a creature, a memory or simply electricity becoming unusually eloquent is left unresolved. The sensible response is to keep listening, preferably without attempting to contact the authorities.