Sine Language - User Guide

Precision test tones, noise colors, binaural beats, and sine sweeps

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Quick Start | Sweep | Tech Specs

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Overview

Sine Language is a precision audio test-tone and noise generator.

Use it to generate sine tones, multiple noise colors, binaural beats, and logarithmic sine sweeps.

Tip: Start with low volume and increase gradually.

Quick Start

  1. Choose a mode from the Mode menu (Sine / Noise colors / Binaural).
  2. Set frequency (Sine) with the horizontal fader.
  3. Press the Power button to start/stop audio.
  4. Use the Left/Right faders to set output level. Double-click a fader to copy levels.

Sine Mode (Free + ISO)

  • Free: Set any frequency from 20 Hz to 20 kHz using the frequency fader.
  • ISO: Select an ISO 1/3‑octave band center; the frequency fader locks while ISO is enabled.
  • Power behavior: ISO tones can start immediately for quick checks.

Noise Modes

Noise modes available:

  • White Noise: Equal energy at all frequencies — ideal for masking distractions
  • Pink Noise: Natural, balanced sound (−3 dB per octave) — perfect for sleep and relaxation
  • Brown Noise: Deep, rumbling bass (−6 dB per octave) — excellent for blocking low-frequency noise
  • Blue Noise: Bright, crisp character (+3 dB per octave) — emphasizes higher frequencies
  • Violet Noise: Strong high-frequency emphasis (+6 dB per octave) — very bright character
  • Gray Noise: Perceptually equal loudness (ISO 226:2003) — all frequencies sound equally loud
  • Green Noise: Mid-range focused (−1.5 dB per octave) — balanced between pink and white
  • Orange Noise: Anti-harmonic structure — less tonal, less resonant sound
  • Brown-Pink Hybrid: Median slope (−4.5 dB per octave) — combines characteristics of both

Stereo/Mono: Some modes allow mono output; when mono is enabled, both channels share the same signal.

Use Left/Right faders to adjust level.

Binaural Beats

  • Select a preset (beat frequency) and choose a carrier frequency.
  • Optional: Add a Pink or Brown noise layer and adjust the noise mix level.
  • Headphones are required to perceive the binaural beat effect correctly.
  • In Binaural mode, the app keeps channels linked for correct left/right pairing.

Levels, Stereo, and Calibration

  • Left/Right: Adjust each channel’s level independently when stereo is enabled.
  • Link: When enabled, moving one fader mirrors the other.
  • Mono: When enabled (supported modes), right mirrors left.
  • Reference: “−12 dBFS” sets a convenient calibration level.

Sine Sweep

  1. Open the Sweep tab.
  2. Enter Start (Hz), End (Hz), and Duration (sec) using the keypad.
  3. Tap Go to run a logarithmic sweep. Tap Abort to stop.

Tips & Safety

  • Protect your hearing: begin at low volume and increase slowly.
  • Very low frequencies and some noise types can feel louder than expected — use caution.
  • Take breaks during long headphone sessions.

Tech Specs

  • Audio output: 2‑channel (stereo).
  • Main generator engine: CoreAudio Default Output AudioUnit with a real‑time render callback.
  • Main generator format: 32‑bit float PCM, non‑interleaved, 44.1 kHz sample rate.
  • Sweep engine: AVAudioEngine + AVAudioSourceNode; uses the device output sample rate; applies a 3 ms fade‑in/out envelope.
  • Sine frequency range: 20 Hz – 20 kHz.
  • Binaural beat frequency range: 0.5 Hz – 40 Hz.
  • Binaural carrier frequency range: 200 Hz – 1000 Hz.
  • Noise mix baseline: 30% noise (adjustable via ±2 dB steps, clamped to 0–100%).
  • Power fades (main generator): 2.0 s fade‑in, 1.0 s fade‑out; mode changes crossfade at ~0.25 s.

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