# Signal Scope Studio — Dual Generator, Scope, FFT, dB

> Dual Generator, Scope, FFT, dB (iPhone/iPad app by Koji Hasegawa.)

- Source: https://appshunter.io/ios/app/signal-scope-studio/id6801408561 (this page in markdown: same URL + `.md`)
- Developer: [Koji Hasegawa](https://appshunter.io/developer/1125823867)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.2 · 14 MB
- Languages: American English, French (France), Japanese
- Released: 2026-08-31
- Data updated: 2026-09-17
- User reviews in markdown: https://appshunter.io/ios/app/signal-scope-studio/id6801408561/reviews.md

## What is Signal Scope Studio?

Signal Scope Studio combines a dual-channel oscillator, an output signal simulator, a live microphone oscilloscope and spectrum analyzer, and a stereo decibel meter in one audio toolkit.

DUAL SIGNAL GENERATOR
• Set sine, square, triangle, falling sawtooth, or white noise independently for LEFT and RIGHT
• Adjust frequency from 20 Hz to 20 kHz and volume from 0 to 100% with 270-degree dials. Frequency also supports numeric entry
• Adjust left and right frequency and volume independently, or link them while preserving the ratios at the time linking is enabled
• Output different frequencies from the left and right channels to produce beats and other effects

OUTPUT SIGNAL SIMULATOR
• Linearly sum LEFT + RIGHT internally and display the waveform and spectrum together
• Adjust Auto Trigger, freeze/resume, vertical and horizontal zoom, and refresh interval
• Control frequency range, spectrum sensitivity, and FFT resolution with dials or pinch and pan gestures
• Save high-resolution graphs with a dark navy background, white text, and green traces to Photos

WAVESCOPE
• Display the time-domain waveform and frequency spectrum of microphone input together in real time
• Use Auto Trigger, freeze display, pinch zoom, and a movable settings window
• Open Dual Signal Generator within the app and measure the actual sound emitted by the same device

DECIBEL METER
• Display relative microphone input levels on analog-style VU meters in real time
• Automatically detect stereo or mono input: two separate meters for the left and right channels in stereo, or one meter in mono
• Use PEAK indicators to spot brief sounds near the maximum input level
• Save a calibration offset to match a commercial decibel meter

MORE
• All features are available for seven days from the original download date. After the trial, Dual Signal Generator and Decibel Meter remain free to use; a one-time purchase lets you continue using WaveScope.
• Includes detailed offline manuals in Japanese, English, and French.
• Supports iPhone and iPad in portrait and landscape.

PLEASE NOTE
• Measurements depend on the device and environment.
• This app is intended for education, experiments, and general audio checks. It is not a substitute for calibrated instruments, certified sound-level meters, or medical devices.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| WaveScope Full Access | $9.99 | one-time |



## Version history (last 2 releases)

### 1.1 — 2026-09-10

• Added Decibel Meter: stereo-capable analog decibel meters, PEAK indicators, and calibration against a reference meter
• Added French language support alongside Japanese and English
• Improved navigation across screens and the offline manuals

### 1.0 — 2026-09-01

No release notes.

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## More apps by Koji Hasegawa

- [Face Page Turner Plus](https://appshunter.io/ios/app/face-page-turner-plus/id1130793367)

All apps by Koji Hasegawa: https://appshunter.io/developer/1125823867

## Related topics

[signal scope studio](https://appshunter.io/ios/topics/signal-scope-studio)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-17.*