Comparison

Stereo Modulator vs TB DualVCF

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Mono to stereo conversion
  • Adjustable stereo width
  • Optional LFO modulation
  • Micro-delay de-correlators
  • Creates natural spatial depth
  • No pitch shifting or echo
Features
Read full description

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.

About

TB DualVCF

This app offers a dual analog filter plug-in for music production, providing a wide range of vintage filter models to shape sound. It features intuitive modulation and envelope followers for creative audio exploration, compatible with AUv3 hosts.

Highlights
  • Dual analog filter sections
  • Dozens of vintage filter models
  • Envelope followers
  • Intuitive modulation editor
  • AUv3 plug-in compatibility
  • Real-time audio processing
Currently charting
Read full description

Dual VCF - the ultimate dynamic filtering AUv3 plug-in! Dual VCF adds motion, shape, and colour. It produces evolving rhythmic movement and complex dynamic filter shapes. It contains dozens of analog filter models with that sought-after sound of the 70s, 80s and 90s. Combined with envelope followers and intuitive modulation editors, it provides almost infinite possibilities for creative aural exploration. Dual VCF features two filter sections, each supporting dozens of low-pass, high-pass and band-pass filter types. Every type is painstakenly modeled after analog filter types found in analog gear, analog synthesizers, and alike, including non-linear filter behavior. Dial in that characterstic 70s, 80s or 90s filter to add some analog flavor to your tracks! Each filter's cut-off frequency and resonance can be sequenced with an intuitive, free-running or beat-synced modulation editor. Seamlessly switch between sine, triangle, noise, or user-defined modulation waveforms. In addition, these parameters can also be modulated with the built-in envelope follower. The ToneBoosters DualVCF app captures the microphone (or external sound card) input and processes the signals in real time. To use it as a plug-in, use an AUv3-compatible host app such as Steinberg Cubasis, Apple Garageband, Audio Evolution Mobile Studio, Auria, AUM, or others. ToneBoosters DualVCF will appear in the list of Audio Unit extensions for effect plug-ins. How to use DualVCF as AUv3 plugin in a host program, start your favourite AUv3 host app (Steinberg Cubasis, Apple Garageband, Audio Evolution Mobile Studio, Auria, AUM, or others) and add TB DualVCF as Audio Unit insert effect to a track or output bus. See below on how to use Audio Units in various host apps. Key features: - The same professional sound as the acclaimed desktop version - Two analog filter sections with dozens of filter designs - Intuitive modulation editor for creative, rhythmic and evolving effects - Undo/redo, and A/B comparison - Color themes for the user interface - Max screen support in Garageband - Optimised for iPad and compatible with iPhone and iPod Touch What you should know: - Licenses acquired for this platform are not compatible with other platforms. - Audio Unit (AUv3) extensions require an iPad mini 2, iPad 4 or later models.

Screenshots

Stereo Modulator3 screens
TB DualVCF3 screens

Verdict

The call

Stereo Modulator and TB DualVCF both sit at 5.0 stars, but that hides the real split: 100% of Stereo Modulator's written reviews are positive against 80% of TB DualVCF's. Stereo Modulator also leads on price ($2.99 vs $4.99) and iOS requirement (10.0 vs 13.0). TB DualVCF's advantage is chart position (#190 vs unranked) and ratings volume (18 vs 3). On rating, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Stereo Modulator costs $2.99 and TB DualVCF $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Stereo Modulator against 4.9 for TB DualVCF. That said, the two scores are not equally well evidenced: TB DualVCF has 18 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 100% of Stereo Modulator's written reviews are positive against 80% of TB DualVCF's.

UpkeepUpdate frequency

Stereo Modulator ships an update every 3 months, TB DualVCF every 2 months. The most recent releases landed on August 30, 2026 and September 8, 2026 respectively.

Scorecard5 real differences · 6 level
Stereo Modulator versus TB DualVCF: the parameters behind the verdict, then further details
ParameterStereo ModulatorTB DualVCF
Price$2.99 — better$4.99
Rating5.0 (3 ratings) — better4.9 (18 ratings)
Positive reviews100.0% of reviews — better80.0% of reviews
Number of ratings318 — better
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank—#190 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better13.0
Further details — not scored
Size2 MB12 MB
Age rating4+4+
DeveloperBlue Mangoo Consulting Company LimitedToneBoosters

Customer experience

Stereo Modulator

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

TB DualVCF

All ratings18 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews15 reviews
Positive80.0%
Neutral6.7%
Negative13.3%

In-app purchases

None

Stereo Modulator

No in-app purchases

None

TB DualVCF

No in-app purchases

Questions

Is Stereo Modulator free?
Stereo Modulator costs $2.99, with no in-app purchases.
Is TB DualVCF free?
TB DualVCF costs $4.99, with no in-app purchases.
Which has better reviews, Stereo Modulator or TB DualVCF?
Stereo Modulator is rated higher. Stereo Modulator averages 5.0 out of 5 from 3 ratings, while TB DualVCF averages 4.9 from 18 ratings.
Do Stereo Modulator or TB DualVCF have ads?
Neither Stereo Modulator nor TB DualVCF shows ads.
Which is updated more often, Stereo Modulator or TB DualVCF?
Stereo Modulator ships an update every 3 months, and TB DualVCF every 2 months. Most recently, Stereo Modulator was updated on August 30, 2026 and TB DualVCF on September 8, 2026.

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