Gnaural Web — attribution and licensing ======================================= A browser re-implementation of Gnaural's scheduling engine and .gnaural preset format, built for the moddys.net music hub ("runs here" collection). UPSTREAM -------- Gnaural — Copyright (C) Bret Logan and contributors. Reference version used: 1.0.20110606 (engine: BinauralBeat.c / BinauralBeat.h; preset readers/writers: gnauralXML.c / ScheduleXML.c; app: main.c). LICENSING OF THIS PORT ---------------------- engine.js — a re-implementation of Gnaural's BinauralBeat engine. The upstream engine is licensed LGPL-2.1-or-later; this port is distributed under the same terms. Licence text: COPYING.LESSER. All other files — GPL-2.0-or-later. Licence text: COPYING. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the licence texts for details. PRESETS AND PACKS ----------------- The 79 sessions built into this page are original to gnaural-web: 15 classic presets plus 64 sessions generated from published focus-level tone sets and the speaker/isochronic design (see below), arranged into twelve downloadable packs (Classic, Waves I-VII, Sleep & rest, Depth, Speakers, Tours) as plain .gnaural files under pack/. The pack READMEs repeat this licensing position. Upstream Gnaural preset files are NOT bundled: the upstream preset archive (SourceForge "Presets" folder) states no licence, so those files are treated as all rights reserved. You can open any .gnaural file you already hold with "Open .gnaural…", and a downloaded pack can be dropped back on this page to add its sessions in the browser that loads it. SPEAKER PACKS (NO HEADPHONES) ----------------------------- The speaker pack is built for loudspeakers and does not use a single binaural pair: its layers are isochronic pulses (one carrier switched on and off at the session's rate — identical in both channels, so one speaker or a pair carries them) and, in one session, two steady carriers four cycles apart whose beat happens in the air of the room (a monaural beat). The pack's tests assert that no session contains an interaural pair. Nothing here is a medical claim, and the evidence is stated as it is: a periodic tone does produce a measurable neural response phase-locked to its rate while it plays (the frequency-following / auditory steady-state response; Bidelman & Powers 2018), but that listening to a rate durably changes brain state is not established — the systematic review of 14 EEG studies found 8 contradicting the entrainment hypothesis, 5 supporting it and 1 mixed, with "no clear trend" (Ingendoh et al., PLOS ONE 2023). The 50% on/off pulse duty is a commercial convention, not a research finding, and this engine's ~2 ms pulse edges differ from the ~5 ms cosine ramps used in gating research; nothing is claimed about either. Not a medical device. Repetitive pulsed tones: ask a clinician first if you have epilepsy or a seizure disorder. FOCUS-LEVEL PRESETS -------------------- The "Focus"-named presets and the focus-level packs are original tone schedules inspired by the publicly documented focus-level tone sets of the Monroe Institute's Gateway programme — layered carrier[beat] pairs that have been independently measured and republished since the 1990s (notation "503[4.2]" meaning a 4.2 Hz beat between two carriers equally separated from 503 Hz). They are recreations of a documented *frequency architecture* only: no audio, narration, scripts or printed material from those recordings are reproduced here, and no exercise names from that programme are used. The wave packs follow its published level order (wave I: focus 3 into 10; II: the focus-12 tools; III-IV: the 10-12 band; V: focus 15; VI: focus 21; VII: focus 27), and its own notes' 30-45 minute sitting length and pink-noise bed convention are what these session shapes are built around. Where the sources disagree, this page states what it used: the focus-21 set here is the "sometimes" reading (250/300 at a 5.4 Hz beat) *plus* the 900[16.2] layer that every published variant of that level carries; the focus-27 set is the second measurement's (50 Hz layer at 0.80 Hz); depth levels 23-26 come from the second measurement lineage (all published sets trace to one analyst's reading — no independent second measurement of levels 23-26 was located); level 22 is described as identical to 21 in every source, so it gets no separate session. Two documented conventions from the source material are kept literally: sessions that bring you back up end with the measured return-to-waking signal (a beta pair around 281 Hz carrying a ~22 Hz beat), and the noise bed sits well under the carriers (the published study's figure is ~15 dB). NO AFFILIATION -------------- This page is not affiliated with, endorsed by, or supported by the Gnaural project. The name "Gnaural" is used only to describe the format and engine lineage. It is likewise not affiliated with, endorsed by, or supported by the Monroe Institute, and no material from that programme is reproduced here. "Hemi-Sync", "Gateway Experience" and the focus-level names are their trademarks and appear in these files only descriptively, as labels for the published tone sets this page's original schedules were built from. SAFETY ------ Binaural beats are an audio experience, not a medical treatment. Keep volumes moderate, skip sessions while driving or operating machinery, and stop if a session feels unpleasant. COMPATIBILITY NOTES ------------------- Playable voice types in this build: 0 binaural beat, 1 pink noise, 3 isochronic pulses, 4 alt isochronic pulses. Types 2 (audio file), 5 (water drops) and 6 (rain) are recognised when reading files but not yet rendered; presets using them still play with their remaining voices, and the page says so. Deviations from upstream, deliberate and documented in engine.js: - output is clamped to [-1, 1] instead of wrapping at 16-bit overflow - the page requests a 44.1 kHz audio context (the engine's sample-rate domain); other output rates are resampled by the browser