Stereo Modulator vs Nostalgia FX
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.
Nostalgia FX
Transform your audio with a collection of retro effects inspired by vintage gaming consoles and analog gear. Add warmth, texture, and character to your mixes with unique reverbs, tape echoes, and modulation.
- Console Reverb with vintage gaming spaces
- Tape Cassette Echo with warble and loop controls
- BBD Chorus for analog-style modulation
- EFX Module with Bit Crusher and Noise Machine
- Global controls for quick shaping
- Freeze button for creative effects
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Playfully Retro Nostalgia is a quick, easy way to transform your sound — from spacious and dreamy to gritty lo-fi chaos. Inspired by vintage gaming consoles, cassette decks, and classic analog gear, it delivers instant character without the fuss. Just load it up, slide some faders, and your clean mix becomes something with warmth, texture, and personality. …an Audio Arcade Console Reverb gives you unique spaces inspired by vintage gaming consoles and the different vibe of each era. Tape Cassette Echo is an imaginative spin on analog tape delay — the kind you might’ve rigged up in your bedroom long before plugins existed. BBD Chorus takes you back with that warm, warbly magic, that started your FX obsession. The EFX Module packs everything you need to turn your sound into a retro lo-fi dream — with warmth, space, and a character that’s hard to find anywhere else. Features -Console Reverb with four distinct eras of vintage gaming spaces -Tape Cassette Echo with warble, tape spike, and loop length controls -BBD Chorus for warm, warbly, analog-style modulation -EFX Module with Speaker Output, Noise Machine, Tune & Tone, and Bit Crusher -Global controls for quick overall shaping -Freeze button for creative stutter and hold effects -Fully compatible with VST3, AAX, AU, AUv3, and Stand-alone
Screenshots
Verdict
The clearest difference is price: Stereo Modulator at $2.99 against Nostalgia FX's $9.99. Stereo Modulator also leads on ratings volume (3 vs 1) and iOS requirement (10.0 vs 12.0). On rating, review sentiment, ads and in-app purchases 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 Nostalgia FX $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Stereo Modulator against 5.0 for Nostalgia FX. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
| Parameter | Stereo Modulator | Nostalgia FX |
|---|---|---|
| Price | $2.99 — better | $9.99 |
| Rating | 5.0 (3 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 3 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 2 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue Mangoo Consulting Company Limited | OSC Audio |
Customer experience
Stereo Modulator
Nostalgia FX
In-app purchases
Stereo Modulator
No in-app purchases
Nostalgia FX
No in-app purchases









