Robert Monroe's Gateway Experience tapes claim specific carrier tones and binaural beats, but there's never been a public record of what's actually in the audio. We ran the official Wave recordings through our own Tape Analyzer tool: real FFT spectrogram analysis, confidence-gated per-channel carrier detection, and a masking-layer (Drift/pink-noise bed) level trace, measured directly from the waveform. Not a transcript, not a guess — the actual numbers.

Methodology: each stage below only appears if the detected binaural beat held steady with ≥20dB signal-to-noise for multiple consecutive scan windows — single-window blips are folded away, not reported. Stages are grouped by actual carrier stability, not just by matching brainwave band — a stage only continues as long as both the left and right tones stay within a few Hz of where that stage started, so a genuine carrier change always starts a new stage, and consecutive stages on the same carrier are never averaged into a frequency that didn't actually play. "Confident beat present in ~X%" means the rest of the file had no binaural tone clear enough to trust, not that nothing was happening (narration and ambient-only stretches are real and expected). When a stage's beat moved enough within itself to matter, it's shown as a range (e.g. "beat rising 4.3 → 5.6 Hz") rather than a single misleading average. See the Tape Analyzer page for full methodology and to run your own files.

Full per-file reports (session event logs, stable-segment breakdowns) available via the Tape Analyzer — drop in any of these tracks yourself to see the complete scan.