Salix is a bold new departure for modular synthesist Loula Yorke, seen here using an antique reed organ to explore the ancient roots of willow trees in magic, myth and medicine, as well as inviting another musician into her recording studio for the first time, clarinettist Charlotte Jolly.

The EP forms a sonic archive of a singular instrument: an antique free reed organ left behind by a previous encumbent of Asylum Studios, (the artists' co-operative in Suffolk where Yorke's Truxalis labelmate and life collaborator, Seiche, has a studio space). The organ is in poor condition and fascinatingly, painfully detuned. Yorke's recordings bring out its host of unusual quirks exacerbated by age and neglect: the powerful rhythmic creaking of the wooden treadles; the bone-shaking resonance emanating from its body at specific pitches; unexpected exclamations of harmonic collision from within the carcass redolent of a human voice; the piercing, shrieking whistles of broken reeds, and the powerful timbres unlocked via Yorke's experiments with various combinations of stops.

The three tracks that form Salix are inspired by a local weeping willow tree, a constant companion photographed over the course of a year. Boughs caught in a gyre. A maiden in mourning. Branches that gesture in the wrong direction. A tree turned upside down. A hand-woven willow basket, an old technology to gather and store. The journey of a lovelorn bard through the underworld, a bundle of willow under one arm for protection.

For the opening track, The Carrier Bag Theory of Fiction, Yorke recorded herself playing a simple unaccompanied improvisation on the organ, the only ornamentation being the processed sounds of the keys being struck and returning to their positions.

For Bundle of Styx, a spell of protection is cast and then broken. Yorke invited virtuoso clarinettist Charlotte Jolly into the studio to test combining the breathy textures of both brass and natural reeds, the instruments uniting and obsuring each other in turn during this one-take improvisation. The organ's unpredictable sharpened tunings take centre stage here, with Jolly using them as a point of departure to conjure a set of peerless harmonic improvisations live in the moment. Throughout the improvisation, Yorke, a self-taught musician, unpracticed on the organ, supports and challenges, freely admitting that she's not always sure what effect her decisions to move up and down the keyboard or pull out certain stops will have. Jolly's genius lies in her ability to meet and build on every uncertain pitch thrown her way, saying of the experience, "I love that Loula isn't classically trained, I can't predict at all what she's about to do."

For the final track, With the Red Dawn, Yorke has come up with another unique combination of textures, this time bringing her own specialism in modular synthesis to the fore. A ten-minute reed organ drone characterised with ever-shifting bass swells and overtones is layered with tuned sines, often shudderingly wave-folded, that ebb and flow both in intensity and harmonic colour according to the duty cycles of eight interrelated LFOs. These recordings are collaged with Yorke's singing voice and a langorous, ascending sequence across two octaves on Jolly's clarinet, all arranged to form a cohesive whole far greater than the sum of its parts. Smatterings of untuned percussion and a fragment of a conversation between the duo left in the final mix cements Yorke's unprecious DIY aesthetic into the release.

At its heart, Salix is like watching the wind in the willows; hundreds of thousands of identical tiny leaves moving in confluence on its branches; at once one thing and many things; moment-to-moment our perception makes out different individuals parts within this expanse of texture, before sinking back into the whole.