# FOLD Stereo to Mono — Stereo Width & Mono Utility

> AUv3 stereo width and mono fold-down utility for iOS music production. (iPhone/iPad app by Shelbybark LLC.)

- Source: https://appshunter.io/ios/app/fold-stereo-to-mono/id6775596671 (this page in markdown: same URL + `.md`)
- Developer: [Shelbybark LLC](https://appshunter.io/developer/1895490257)
- Category: Music, Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 13.0 · 11 MB
- Released: 2026-06-04
- Data updated: 2026-08-09
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/fold-stereo-to-mono/id6775596671/reviews.md

## What is FOLD Stereo to Mono?

FOLD is a stereo width and mono fold-down utility for iOS. Use it as an AUv3 plugin in any compatible host.

FEATURES
Width — Continuously variable stereo width from mono to full stereo. Drag the knob or tap to enter an exact value. Width changes are smoothed to avoid clicks.

Mono — One tap collapses your stereo signal to mono with a click-free ramp. Instantly check how your mix translates to a single speaker, earbuds, or phone.

Output Trim — ±12 dB gain stage after the width processing. Compensate for any perceived loudness shift when narrowing a wide mix.

Phase Correlation Meter — Real-time bar display with a numeric readout. Green means your signal is mono-compatible and safe. Amber indicates partial cancellation. Red flags phase cancellation issues that will cause problems on mono playback devices.

WORKS AS AN AUv3 PLUGIN

Load FOLD in Loopy Pro, GarageBand, AUM, Audiobus, Cubasis, n-Track, or any AU-compatible host on iPhone or iPad. The AUv3 extension exposes all parameters for host automation.

Free. No in-app purchases. No ads. No account required.

## Key features

- Variable stereo width control
- Click-free mono fold-down
- Output trim gain stage
- Real-time phase correlation meter
- AUv3 plugin support
- Host automation compatibility


## Frequently asked questions about FOLD Stereo to Mono

### What is FOLD Stereo to Mono?

FOLD Stereo to Mono is an audio utility app for iOS that allows users to adjust stereo width and convert stereo signals to mono. It functions as an AUv3 plugin within compatible music production applications.

### How does FOLD Stereo to Mono handle stereo width?

FOLD Stereo to Mono offers continuously variable stereo width control, allowing you to adjust from full mono to full stereo. Changes are smoothed to prevent audible clicks or pops in your audio.

### Can FOLD Stereo to Mono convert stereo to mono?

Yes, FOLD Stereo to Mono provides a one-tap function to collapse your stereo signal to mono. This process is designed to be click-free and uses a ramp for smooth transitions, ideal for checking mix translation.

### What is the Phase Correlation Meter in FOLD Stereo to Mono?

The Phase Correlation Meter in FOLD Stereo to Mono is a real-time display that shows the mono compatibility of your stereo signal. Green indicates good compatibility, amber suggests partial cancellation, and red highlights significant phase issues.

### Does FOLD Stereo to Mono have ads?

No, FOLD Stereo to Mono is completely free and does not contain any advertisements. It also does not require in-app purchases or an account to use.

### What devices is FOLD Stereo to Mono compatible with?

FOLD Stereo to Mono is available for iPhone, iPad, and iPod. It requires an AUv3-compatible host application to function.

### How often is FOLD Stereo to Mono updated?

FOLD Stereo to Mono was last updated on June 17, 2026, with version 1.0.1. While specific update frequency isn't detailed, this indicates recent development and support.

### What is the age rating for FOLD Stereo to Mono?

FOLD Stereo to Mono has an age rating of 4+. This rating is generally applied to apps with minimal or no objectionable content.

## Version history (last 2 releases)

### 1.0.1 — 2026-06-17

This update brings layout and usability improvements:

• The UI now scales smoothly when the window is resized, so everything fits at smaller sizes without getting cut off.
• The MONO button now has a minimum height to keep it easy to tap at any window size.
• The About screen now has a "Done" button instead of an "×" close icon, making it easier to dismiss on touch screens.

### 1.0 — 2026-06-04

No release notes.

## More apps by Shelbybark LLC

- [FET Acoustic Compressor](https://appshunter.io/ios/app/fet-acoustic-compressor/id6763790891)
- [Ten Band EQ](https://appshunter.io/ios/app/ten-band-eq/id6781364061)

All apps by Shelbybark LLC: https://appshunter.io/developer/1895490257

## Related topics

[fennec stereo](https://appshunter.io/ios/topics/fennec-stereo) · [stereo to mono](https://appshunter.io/ios/topics/stereo-to-mono)

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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 2026-08-09.*