The seventeen techniques behind a session, named.

What it is

A slow, smooth rise-and-fall in the music's volume envelope — about one full cycle every ten seconds. Roughly six breaths a minute.

Why we use it

Slow paced breathing near 0.1 Hz couples with the body's baroreflex resonance and supports parasympathetic regulation. The music doesn't tell you to breathe — it offers a pace your body can settle into without instruction.

What the evidence says

The cardiorespiratory and music-therapy adjacent literature — Bernardi 2006, Vickhoff 2013, the Lehrer paced-breathing tradition — supports paced respiration near 0.1 Hz as a credible auditory design target.

What we don't claim

We don't measure your breath or heart rate, so we can't claim you actually breathed at 0.1 Hz. We don't claim HRV training, blood-pressure improvement, or autonomic therapy.

What it is

A subtle modulation embedded in one or more music layers, at a rate chosen for the goal: faster (≈14–18 Hz) for focus, mid (≈10 Hz) for relaxation, slower (≈3–6 Hz) for meditation and wind-down.

Why we use it

The auditory steady-state response is a well-established neural phase-locking effect. Embedding it inside listenable music — rather than as bare tones — keeps the listening pleasant while the brain still synchronises to the rhythm underneath.

What the evidence says

The auditory steady-state response is consistently observed in EEG and MEG. Whether AM in listenable music shifts attentional state is supported by recent product-aligned work — Woods et al. 2024, Communications Biology — with caveats: the strongest validation has company-conflict considerations, and independent replication is partial.

What we don't claim

We don't claim guaranteed focus improvement, EEG entrainment in any specific listener, or clinical cognitive treatment. The technique influences neural response on average; individual response varies.

What it is

A short opening phase that plays slightly different tones in each ear over headphones — 200 Hz on the left and 210 Hz on the right, say. Your brain perceives the difference as a slow beat at 10 Hz, in the alpha band.

Why we use it

The 2025 perioperative meta-analysis of 15 RCTs reports a standardised mean difference of about −1.38 for state anxiety with binaural-embedded interventions — an effect size in the range achieved by pharmacological premedication. We use it as the gateway phase to set up the body of the session.

What the evidence says

Meta-analytic evidence supports small-to-moderate effects on anxiety, mood, cognition, and pain in certain contexts. The proposed mechanism — EEG entrainment, hemispheric synchronisation — is contested in independent reviews. We treat the clinical effect as more robust than the mechanism that's supposed to explain it.

What we don't claim

We don't claim EEG entrainment, hemispheric synchronisation, consciousness expansion, or any of the extraordinary-perception lineage from the Hemi-Sync / Gateway tradition. The architectural shape borrows from that tradition as design inspiration. The claims do not.

What it is

Subtle headphone-induction elements held inside the body of the session — drones with embedded carrier-frequency offsets — supporting the listening state without being foregrounded as a tone.

Why we use it

Smaller trials show binaural-embedded soundscapes can reduce state anxiety in non-clinical contexts. The clinical effect is more robust than the EEG-entrainment mechanism sometimes proposed for it.

What the evidence says

Multiple smaller trials in non-clinical adult populations.

What we don't claim

We don't claim EEG entrainment, brainwave control, or guaranteed state change. It's an emerging-tier compositional choice. Not a treatment.

What it is

Quiet pink-noise pulses scheduled into windows when you're likely to be in slow-wave sleep — without measuring sleep stage. The strongest evidence here uses EEG to phase-lock pulses to actual slow waves. We deliver this open-loop, and label it accordingly.

Why we use it

Closed-loop pink-noise stimulation phase-locked to slow oscillations has shown effects on slow-wave activity and memory in controlled studies. We use the technique as a conservative open-loop approximation — a credible design target without inheriting the closed-loop outcome claims.

What the evidence says

Ngo et al. 2013 (Neuron); Papalambros et al. 2017; Wunderlin et al. 2021 — closed-loop slow-wave-sleep stimulation. Open-loop versions are an approximation; some pulses inevitably fall outside slow-wave windows.

What we don't claim

We don't claim closed-loop slow-wave stimulation, memory enhancement, insomnia treatment, or sleep-stage targeting.

What it is

A low-level slow pulse in the 50–70 BPM range and audible 40–80 Hz low-frequency content — felt as much as heard. A biological tempo anchor and a subtle sense of grounding in the body.

Why we use it

Heartbeat-like and vibroacoustic cues can support calming or body-oriented attention in some contexts. We use them as a comfort and grounding layer — never as the primary intervention.

What the evidence says

A mixed body of work — neonatal heartbeat-sound studies (Webb 2015, Loewy 2013), vibroacoustic-therapy reviews (Mosabbir 2020), and clinical music-therapy contexts. Effects vary strongly by population and delivery system.

What we don't claim

We don't claim vagal stimulation, pain treatment, trauma treatment, infrasound effect, or altered-state induction. Sub-20 Hz infrasound is deliberately excluded from the engine.

What it is

A low-level pink-noise (or related stochastic) bed beneath the active layers. Helps quieter modulation and tonal elements sit naturally inside the soundscape, and reduces the salience of environmental noise.

Why we use it

Compositionally, pink noise is the backbone of countless sound designs because of its 1/f spectrum, which the auditory system reads as natural. In Soundscaper, it's substrate, masking, and soft-fascination material — not a hearing-intervention claim.

What the evidence says

Pink-noise sleep and masking literature, plus stochastic-resonance work (Zeng 2000; the Krauss-lineage tinnitus studies) for the near-threshold-detection use case.

What we don't claim

We don't claim tinnitus treatment, hearing improvement, or sensory repair.

What it is

Very soft, close, non-verbal foley-like events mixed far below the main bed. The sound of close gentle sounds, not music. Optional texture. Never speech, never subliminal.

Why we use it

Roughly 20–30% of listeners are ASMR-responsive and report calm, tingling, and attentional narrowing from close gentle sounds. For responsive listeners, it's a comfort layer; for non-responsive ones, it's silent.

What the evidence says

Lochte et al. 2018 (BioImpacts) on ASMR neuroimaging; Poerio et al. 2018 (PLoS ONE) on physiological and affective effects; growing literature on responder versus non-responder profiles.

What we don't claim

We don't claim universal relaxation, therapy, hidden messages, or subliminal effects. Some listeners experience misophonia rather than calm. The layer is opt-in.

What it is

Naturalistic environmental recordings — water, rain, wind, birdsong — used as a quiet bed beneath the composed content. Sometimes the dominant surface, sometimes faint texture beneath the music.

Why we use it

The restorative-environments and stress-recovery literature consistently shows effects on self-reported stress, attentional restoration, and parasympathetic shift. Water and birdsong are the most studied; mixed-environment recordings are widely used in dental, MRI-anxiety, and recovery-room contexts.

What the evidence says

Ulrich 1984 (Science) — the foundational restorative-environments paper; Alvarsson 2010 on nature-sound stress recovery; Buxton 2021 (PNAS) review. Strong for effects in adjacent domains; mechanism specificity is Emerging.

What we don't claim

We don't claim treatment effect from nature listening alone. Nature is substrate beneath the active layers. The personalised composition is what differentiates Soundscaper.

What it is

Long sustained tonal beds — pitched in conservative ranges, minimal melodic activity — that anchor the listening state.

Why we use it

Drones underpin the meditative-listening tradition documented across the music-in-dementia and receptive-music-therapy literature. They're also the structural anchor of grief and emotional-heaviness compositions, where active rhythmic content would be inappropriate.

What the evidence says

Cochrane reviews on music-based interventions — in dementia, depression, cancer-related symptoms — where drones recur as common substrate. Strong as substrate; Emerging as the active intervention.

What we don't claim

We don't claim treatment effect from drone listening alone. The drone is substrate. The active intervention is the technique stack layered on top.

What it is

Listening to recorded or live music as the intervention itself — the basic substrate of every Soundscaper session. Personalisation is what we add on top of this base.

Why we use it

Receptive music therapy has the most mature evidence base of any technique in this catalogue. The Cochrane Library hosts multiple high-quality reviews: music interventions in dementia, depression, cancer-related symptoms, perioperative anxiety, and pain. Effect sizes are typically small-to-moderate. The strongest evidence supports adjunctive use rather than standalone clinical treatment.

What the evidence says

van der Steen 2024 Cochrane (dementia, including the MIDDEL trial across ~1,000 residents); Bradt 2021 Cochrane (cancer, 81 trials); Aalbers 2017 Cochrane (depression); BJPsych Open 2025 meta-analysis (depressive symptoms, SMD ≈ −0.97).

What we don't claim

We don't claim treatment of any clinical condition. The Cochrane evidence supports adjunctive use. We work inside that ceiling.

What it is

Spatially-rendered audio — binaural-spatial via head-related transfer functions, or ambisonic-decoded for compatible playback — for meditation and immersion contexts. (This isn't shipping yet; it's on the way.)

Why we use it

Small studies suggest spatial rendering supports deeper meditation states and stronger immersion than stereo. The mechanism is plausible — spatial cues recruit attentional networks differently from stereo — but not nailed down.

What the evidence says

Multiple small RCTs on spatial audio in meditation contexts; the broader HRTF and binaural-spatial literature in JASA and AES Journal.

What we don't claim

We don't claim depth-of-meditation outcomes from spatial rendering. The comfort and immersion benefit is the durable effect; deeper-state claims would exceed the evidence.

What it is

Smooth amplitude tapers at session boundaries — long fades, gentle re-orienting swells — that close the session without abruptness.

Why we use it

Standard practice in clinical music therapy. Tapers reduce startle, support orderly transition out of the listening state, and respect the integration / re-orientation step at the end of every clinical session.

What the evidence says

Clinical music-therapy practice references — Bunt & Stige 2014; Wigram et al. 2002. Strong as compositional craft; not the kind of technique that has its own RCT base.

What we don't claim

Tapers are how we end sessions. They don't carry a treatment claim.

What it is

Short cross-fade and held-drone bridges between phases. The body of a session is built as a chain — Settle → Deepen → Sustain → Integrate — and the bridges between each are part of the design.

Why we use it

Sequencing and pacing carry weight in clinical music therapy. The order of techniques and the way each is led into and out of is itself part of the work. Without bridges, technique-stack changes would feel jarring.

What the evidence says

Clinical music-therapy practice references — Bunt & Stige 2014; Bruscia 2014.

What we don't claim

Transitions are how we link phases. They don't carry a treatment claim.

What it is

A compositional posture rather than a DSP layer: the music sits in slow tempo, often modal or minor, for grief, heartbreak, emotional heaviness, and self-compassion sessions.

Why we use it

The iso-principle in clinical music therapy: meet the listener's current state first, then move with it, rather than imposing a different state. Mood-music meta-analysis supports congruent — rather than incongruent — music for matching the listener's emotional weight.

What the evidence says

Iso-principle clinical-practice tradition (Altshuler 1948; Davis & Thaut adaptations); Saarikallio & Erkkilä 2007 on adolescent mood-regulation through music; the broader mood-music literature.

What we don't claim

We don't claim grief treatment or depression treatment. The iso-principle is a design rule informed by clinical music-therapy practice. The boundary is at /safety.

What it is

A sparse melodic motif that appears intermittently and recurs without becoming the foreground of the listening.

Why we use it

A perceptual anchor that supports attentional continuity without becoming a distraction. In focus and creative-flow sessions it sustains attention. In loneliness and dementia-comfort sessions it acts as companionable presence.

What the evidence says

Largely clinical-practice and AM-music-aligned rather than from RCTs of the motif itself. Treated as a compositional craft choice supported by adjacent literature.

What we don't claim

Motifs are a craft choice, not a treatment. The evidence here is for the broader compositional approach, not the motif specifically.

What it is

Layered tonal elements that move dynamically — in pitch range, density, and rhythmic emphasis — to maintain a steady but not monotonous attentional surface during focus sessions.

Why we use it

Focus is an attention problem, not a noise-masking problem. Static noise as a focus aid has weak evidence; some compositional dynamism — neither static nor highly variable — is the active region for sustained attention. Used only inside the focus support area.

What the evidence says

Brain.fm-lineage commercial and published work, with conflict-of-interest caveats and partial independent replication.

What we don't claim

We don't claim guaranteed focus improvement or productivity outcomes. The technique influences attentional surface on average; individual response varies.