JAX Convolutor PRO (AU) vs PaSSBot
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JAX Convolutor PRO (AU)
This app uses complex signal processing to create realistic reverberation effects by analyzing real-world environments. It allows users to apply these effects to audio material, making it sound as if it were played in a specific location. Advanced adjustments can refine the results for professional audio production.
- Realistic reverberation effects
- Impulse response analysis
- Audio material manipulation
- FFT algorithm processing
- Customizable adjustments
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Remarks: This is an Audio Unit, but you have to open the distribution app ones at least to install the included IR file library. Convolution is a highly complex signal processing approach, that needs some certain computation power. The recorded impulse response of a real world environment is used to render a reverberation effect onto any audio material, so that it sounds like the source was played in that original room or at that location. Some further adjustments and manipulations can be applied to refine these results. Now this all may sound somewhat naive at first listen but the entire calculation is extremely complex math, so that the very first processors and computers were able to perform this in realtime rather around the end of the last millennium. Basically, the impulse responses and the audio stream are completely analyzed with FFT algorithms and then the entire analysis data will be cross-modulated into the realtime audio stream by performing a repeated highly performance intensive re-synthesis and accumulation processing for each analysis block of the impulse response. Therefore it is a crucial performance factor that you use JAX Convolutor with larger processing buffer sizes (1024) samples. Shorter buffers may raise the CPU hit exorbitantly for several reasons. The manual is embedded into the main app.
PaSSBot
This app is a stochastic filter bank audio processor for iPad, offering advanced sound manipulation with various filter types and powerful stochastic generators. It allows for precise control over filter parameters and harmonic distribution, ideal for creating complex audio textures.
- Stochastic filter bank audio processor
- Multiple filter types (Biquad, Ladder, SEM, Resonators)
- Up to 64 filters in stereo
- Powerful stochastic generators
- Individual filter parameter control
- Harmonic distribution options
- Precision DSP rendering (<1ms control rate)
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PaSSBot is a unique stochastic filter bank audio processor. The desktop VST/AU version of PaSSbot has already arrived in February 2020 and this iOS version is equivalent to the latest version 2.1. PaSSBot filter types are Biquad, StateVariableFilter, Ladder, SEM and Resonators. With behaviors of bandpass, Lo + Hipass, Notch and up to 64 of them in true stereo ! The user can set values of center frequency, gain and resonance of the each filter, which will be then eloborated with powerful stochastic generators ( 4 independent GENs for each filter ) with continuous or discrete probabilistic distributions but also with standard waveforms. One can set each filter parameters individually, but also distribute them in harmonic order, again the harmonic spread ratio can be set by the user or even can be modulated by a GEN. Precision DSP rendering, less than 1milisec. control rate precision. The filters can run continuously or be triggered manually. In that case, each filter will be applied an independent AR envelope with configurable random duration. Important notes : - A recent iPAD model is being recommended and also setting the host buffer size to 128 or higher greatly helps to the CPU needs which also heavily depends on the number of parallel filters being used. - The resonators can be sensitive to input signal level. - The PaSSBot manual can be found at this link. https://www.sonic-lab.com/PaSSBot_files/PassBot_manual.pdf sonicLAB PaSSBot youtube playlist : https://www.youtube.com/playlist?list=PLP0cOkraQHDYUoMG6BETTN1eGm-Kq5z0T
Screenshots
Verdict
The clearest difference is price: JAX Convolutor PRO (AU) at $9.99 against PaSSBot's $34.99. JAX Convolutor PRO (AU) also leads on device support (3 vs 1). PaSSBot's advantage is rating (5.0 vs 4.6) and update cadence (every 4 months vs every 25 months). On review sentiment, ratings volume, 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
JAX Convolutor PRO (AU) costs $9.99 and PaSSBot $34.99 up front. Neither carries in-app purchases, so what you see is what you pay.
PaSSBot holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 5 and 8 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
JAX Convolutor PRO (AU) ships an update every 25 months, PaSSBot every 4 months. The most recent releases landed on September 23, 2026 and June 30, 2026 respectively.
| Parameter | JAX Convolutor PRO (AU) | PaSSBot |
|---|---|---|
| Price | $9.99 — better | $34.99 |
| Rating | 4.6 (5 ratings) | 5.0 (8 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 5 | 8 — better |
| Update frequency | Every 25 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 139 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Jens Guell | SonicPlanet Audio Video Teknolojileri Anonim Sti. |
Customer experience
JAX Convolutor PRO (AU)
PaSSBot
In-app purchases
JAX Convolutor PRO (AU)
No in-app purchases
PaSSBot
No in-app purchases





