s16n Audio Lab Y-T view with dual timebase and measures

A browser oscilloscope, spectrum analyzer, and wow & flutter meter for USB audio inputs — audio frequency only (not RF or lab-bandwidth scopes). Plug in a USB ADC, pick the device, and Start — or use built-in demos. Useful for checking line-level signals from turntables and tape decks for setting head azimuth, anti-skating, W&F, testing other audio equipment, codecs, and test gear.

Core scope features are free. Pro ($15.99 via PayPal) unlocks FFT above 10 kHz, display interpolation, notch filter, THD, cursors, trigger level, Y-T math, independent A/B time/div and Y, Phase Aid, extra W&F standards, and Save Video. After payment, enter the email you paid with and the license key in the app.

Open Audio Lab

Features

  • Y-T, X-Y (Lissajous), W&F, and FFT views
  • Dual channels A / B with show/hide and custom colors
  • Independent A/B time/div and A/B Y (unlock B from A) — Pro
  • Trigger: rise / fall / either, A or B source; adjustable trig level — Pro
  • DC / AC coupling
  • Notch filter (Off / Notch / Inv) with frequency presets — Pro
  • Persist Off / Lo / Hi (phosphor-style trail)
  • Y-T display interpolation: Sin(x)/x or oversample — Pro
  • Y-T math channel: A+B, A−B, A×B, A÷B — Pro
  • Phase Aid chord line on X-Y for alignment — Pro
  • Auto scale and live measures (Vpp, RMS, freq, period, duty, and more); THD — Pro
  • Drag A/B cursors — Pro; FFT span above 10 kHz — Pro
  • Demos: 1 kHz sine, harmonics, calibrated 3 kHz · 4% THD, tape wobble, ping-pong sweep, rotating Lissajous, CD RF eye, and an X-Y “s16n” vector
  • Save as PNG; Save 10s video — Pro

Wow & flutter

Built-in W&F meter on channel A — play a 3.15 / 3 kHz test tone from the deck or turntable.

  • Standards: DIN (free); JIS, NAB, CCIR, 2σ, and unweighted — Pro
  • Carrier: Auto, 3150, 3000, or 1000 Hz
  • Turntable eccentricity notch: Off, 33, or 45
  • Range: Auto, 0.1, 0.3, 1, or 3%; hold / average with reset

Example: Lissajous

X-Y (Lissajous) view for tape head azimuth — aim for a tight, stable ellipse/line on a high-frequency test tone. The FFT is also useful for this adjustment: aim to minimize the wandering. Pro Phase Aid draws a chord line to help with alignment.

Audio Lab X-Y Lissajous view

Example: FFT

Audio Lab FFT spectrum

Example: independent time bases

Separate A and B time/div so each channel can be scaled independently — useful when comparing signals at very different frequencies.

Audio Lab Y-T with independent A/B time bases

Works on a smartphone

s16n Audio Lab on a phone