Stereo Modulator vs TfxReverb
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.
TfxReverb
This audio plugin generates digital reverb effects using a unique algorithm. It offers simple operation with an auto-size mode that adjusts parameters with a single dial, and features delay lines inspired by vintage bucket brigade devices for creative pitch-shifting.
- AudioUnit Extension plugin
- BBD-inspired delay lines
- Adjustable input filters
- LFO modulation
- Tempo sync
- Auto size mode
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TfxReverb is a reverb effect AudioUnit Extension plugin. It uses algorithm to generate digital reverb sound. TfxReverb is designed for simple and easy operation. When auto size mode is enabled, number of parameters can be controlled by a single dial to adjust size of the reverb sound, which can be synced to tempo. It features delay lines which are inspired by BBD (bucket brigade device). The delay line uses fixed length buffer and an artificial clock to sample input signal in variable sampling rate. When the delay time is changed, the delay line can produce pitch change effect which is similar to the behavior of the BBD based unit. Features AudioUnit Extension - Input lowpass filter: From 1KHz to 20KHz - Input high-pass filter: From 20Hz to 500Hz - LFO Frequency: From 0.01Hz to 10Hz - LFO Intensity: From 0.0 to 1.0 - Pre Delay: From 1ms to 100ms - Size: From 0% to 100% - Auto size mode: On / Off - Decay: From 0% to 100% - Damp: From 0% to 100% - Output Lowpass Filter: From 1KHz to 20KHz - Early/Late Mix: From 0% to 100% - Dry/Wet Mix: From 0% to 100% - Tempo Sync: On / Off - Tempo (manual) : From 1bpm to 999bpm - Effect Switch: On / Off Host Application Host application uses system audio input as an audio source and processed audio signal is routed to the system audio output.
Screenshots
Verdict
The clearest difference is rating: Stereo Modulator at 5.0 against TfxReverb's 4.5. Stereo Modulator also leads on review sentiment (100% vs 75%) and update cadence (every 3 months vs every 10 months). TfxReverb's advantage is price ($1.99 vs $2.99). On ratings volume, ads, in-app purchases and monetization model 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 TfxReverb $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Stereo Modulator holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 3 and 8 respectively. Written reviews point the same way: 100% of Stereo Modulator's written reviews are positive against 75% of TfxReverb's.
Stereo Modulator ships an update every 3 months, TfxReverb every 10 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.
| Parameter | Stereo Modulator | TfxReverb |
|---|---|---|
| Price | $2.99 | $1.99 — better |
| Rating | 5.0 (3 ratings) — better | 4.5 (8 ratings) |
| Positive reviews | 100.0% of reviews — better | 75.0% of reviews |
| Number of ratings | 3 | 8 — better |
| Update frequency | Every 3 months — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 13.6 |
| Further details — not scored | ||
| Size | 2 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue Mangoo Consulting Company Limited | Ryo Togawa |
Customer experience
Stereo Modulator
TfxReverb
In-app purchases
Stereo Modulator
No in-app purchases
TfxReverb
No in-app purchases









