Record and compare
Keep a session as audio plus the measurement, label it, mark a baseline and see exactly what changed.
Recording is part of Pro. Choose the view you want to keep (RTA, FFT or Spectrogram), then tap Rec. A red REC bar counts the time; tap Stop to finish. On iPhone a Recording saved note appears at the top; View opens the Recordings list.
Each recording is the audio, as a mono WAV, plus the measurement that was on screen while it ran, kept in step with the audio. It is named after the moment it started, like Session 2026-10-17 21:30. Freeze pauses the measurement but not the audio, so leave Freeze off while you record.
If a call or Siri interrupts, the input changes sample rate, or you leave the app or open Recordings or RT60, SoundMess Lab stops the recording and keeps what was captured up to that point.
Open it with the list button in the top row. Each row shows the name, its type (RTA, FFT or SPECTROGRAM), when it was made, its length, its tags, and a star if it is the baseline.
- Tap a recording to play it back.
- Swipe right for
EditandBaseline; swipe left to delete. - Touch and hold for
Edit details,Set as baselineandCompare to baseline.
Edit details holds a name, free notes, and tags separated by commas (studio, before, speaker-left).
The player shows the recording's chart moving with the audio. Drag the timeline to scrub, or skip back and forward 5 seconds. From the share button: Share WAV, and for RTA and FFT recordings Export time-series CSV, every frame of the measurement with its time.
The before-and-after view: the room with and without the panel, the speaker before and after you moved it.
In Recordings, tap
Compareat the top left.Choose two recordings of the same type, both RTA or both FFT.
Tap
Compare selected.
The A/B Comparison overlays the two spectra, each averaged over its whole recording, with A as the baseline and B as the one compared. Under the chart, Largest differences lists up to twelve frequencies with both levels and the change, for example 250 Hz, 58.1 → 52.4 dB, −5.7.
A baseline saves choosing every time: mark your reference recording with Set as baseline (one per type), then touch and hold any other recording of that type and pick Compare to baseline.
Related
- ExportTake a measurement out of the app as a picture, a spreadsheet or a one-page report.
- Real-time analyserThe sound split into fractional-octave bands from 20 Hz to 20 kHz, drawn as bars you read from the bottom up.
- QuestionsAccuracy, Pro, recordings and privacy, and what to check when something isn't working.
Still stuck? Write to zhi@nonoaudio.com. Support page