Stereo Modulator vs JAX MASTERING
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stereo Modulator
This audio effect plugin transforms mono sound into stereo, adding width and depth. It uses micro-delays to create a natural sense of space, with optional LFO modulation for a Leslie speaker-like effect without pitch shifting. Ideal for creating separation in mixes, especially for guitars and vocals.
- Mono to stereo conversion
- Adjustable stereo width
- Optional LFO modulation
- Micro-delay de-correlators
- Creates natural spatial depth
- No pitch shifting or echo
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Stereo Modulator is an AU3 effect that converts mono sound into stereo, with an adjustable width and optional LFO modulation. It works by using a bank of randomized stereo de-correlators that apply micro-delays to introduce random differences between the spectrums of the left and right audio channels. In its output we hear a natural sense of space that is not present in mono recordings. It's similar to the sound space one gets from using a stereo reverb plugin except that it is tight and clear, without echo. It can operate either as a static effect or it can be gently modulated by a low-frequency oscillator. The modulation is akin to the sound of a Leslie speaker, except that it doesn't do any pitch shifting, so the output remains focused and tuning is not compromised. This effect is especially useful for mixing overdriven electric guitar sounds together with vocals. Using Stereo Modulator on the guitars, we can push them out to the sides, creating a space in the centre for the vocal to cut through, without needing to reduce the volume of the guitars. NOTE: Stereo Modulator is an AU3 plugin only, not a standalone app. To use it, you will need an audio unit host app such as Garageband or Audiobus.
JAX MASTERING
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Please note, that AudioUnits (AUv3) require a supporting host application to perform. The MBC Pro is a multi band / master bus audio processor (companders), suitable for mastering. Parallel analog modeled filters split the audio stream into 5 freely adjustable bands, on which the 5 dynamic processors will perform action in parallel - each wit its own set of parameters - or linked together. Input and output is stereo, parallel processing for each frequency band (mix with the original) is possible. The effect processors now have zero latency. A PDF manual is included with the app : https://audio.digitster.com/wp-content/uploads/2024/04/JAX-MASTERING-MBC-Pro.pdf This app is truly 'universal', meaning, unit is available for: - MacOS (Silicon) - iOS (iPhone) - iPadOS (iPads) - visionOS (Apple Vision Pro)
Screenshots
Verdict
The clearest difference is price: Stereo Modulator at $2.99 against JAX MASTERING's $9.99. Stereo Modulator also leads on update cadence (every 3 months vs every 25 months) and iOS requirement (10.0 vs 12.0). On ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Stereo Modulator costs $2.99 and JAX MASTERING $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Stereo Modulator ships an update every 3 months, JAX MASTERING every 25 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | Stereo Modulator | JAX MASTERING |
|---|---|---|
| Price | $2.99 — better | $9.99 |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 months — better | Every 25 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 2 MB | 78 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue Mangoo Consulting Company Limited | Jens Guell |
In-app purchases
Stereo Modulator
No in-app purchases
JAX MASTERING
No in-app purchases
Questions
Is Stereo Modulator free?
Is JAX MASTERING free?
Do Stereo Modulator or JAX MASTERING have ads?
Which is updated more often, Stereo Modulator or JAX MASTERING?
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