SOLO [Nr.19] vs DubFilter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SOLO [Nr.19]
This application is designed for musicians to study and perform a specific algorithmic composition. It digitally implements the original analog setup for a complex musical piece, allowing soloists to create polyphonic music through feedback systems. It provides two distinct performance versions for study.
- Digital implementation of analog setup
- Algorithmic composition performance
- Feedback system for polyphonic music
- Study and live performance tool
- Two performance versions included
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*** This app is for the Musician who want to play SOLO [Nr.19] of Karlheinz Stockhausen for Study, Live Performance, Concerts, Lessons etc... It have not sense to employ this app otherwise. You can hear fully the first version performed by Enrico Francioni (Contrabass) and the second version performed by Simonetta Sargenti (Violin) *** SOLO [Nr.19] is an algorithm that aims to implement digitally the original analog set-up for the performance of six versions of Solo für melodieninstrument mit rückkopplung by Karlheinz Stockhausen. The original composition was conceived for five persons. Four technicians plus the main instrument performer. SOLO [Nr.19], performs the work of four technicians for each of the six Stockhausen's versions. "Solo" (für Melodieninstrument mit Rückkopplung) by Karlheinz Stockhausen is a piece written for any solo melodic instrument and employs a feedback system to allow the soloist to create polyphonic music. Written in 1966 with its world premiere in Tokyo in the same year, its origin dates back to the same period as the composer's work "Kontakte". "Solo" uses the technique of recording onto tape with a single head together with a moveable arrangment of playback heads, allowing for the creation of complex sounds through accumulation. The original version (with an analog technical set-up) requires a solo instrumentalist as 4 assistants (technicians): three assistants operating the opening and closing of sliders (L/R channels)–respectively the microphone, delay-line and output–and an assistant for the change of time values of the taps in the delay-line. During a performance a part of what the instrumentalist plays is captured by a two-channel recorder. Through a feedback circuit, the sections are recorded more or less densely stacked and processed with a variable delay time; the result is then played by two sets of speakers and mixed with the direct sound of the soloist. The score (Universal Edition-Wien, 1969) consists of six pages of music and six pages of Form- Schema (the number six can be considered a key element), in addition to explanatory notes (very detailed) for the performance the composition. "Solo" is one of those compositions by the author employing "controlled alea" as a compositional language. Indeed many choices are left to the soloist and cover almost all the events: from the selection of a version, the positioning of the material, the types of tonal variation requests, the order of pages and more. In reality these faculty are provided as input by the composer through the management of macroscopic or microscopic order parameters, restricting the possible versions (virtually infinite) at a predefined or definable set of possibilities. In this piece, the role of the interpreter is very important in the creation of a performance that is always unique and unrepeatable every time.
DubFilter
This app provides a powerful dual filter with resonance and an exclusive overlap parameter. It also features a redesigned stereo sample player with LFO and scrubbing, along with extensive MIDI and file management capabilities.
- Dual low-pass/high-pass filter
- Resonance and Overlap parameter
- Stereo sample player with LFO
- Scrubbing capabilities
- Audiobus and Inter-App Audio support
- MIDI control and file management
- Preset morphing pad
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The Dub Filter is a dual low-pass/high-pass 24/48 dB filter, with resonance and the exclusive Overlap parameter! It contains a completely redesigned stereo sample player with LFO and scrubbing capabilities. Main Features: - Audiobus and Inter-App Audio support (sender and FX) - State Variable Filter (Low-Pass and High-Pass) with resonance and overlap - Built In Stereo Sampler with varispeed and scrubbing - Control Manager LFO for all the Parameters - Midibus, Virtual Midi and Network: 14 bit NRPN controllers - File Manager, sharing common audio files via iTunes, Dropbox and AudioCopy - Snapshots Presets Morphing Pad - Post Fx Chain: Low-shelf Filter, High-shelf and Compressor
Screenshots
Verdict
The clearest difference is monetization model: SOLO [Nr.19] at free against DubFilter's free with in-app purchases. DubFilter's advantage is rating (4.7 vs 4.4) and ratings volume (71 vs 7). On price, review sentiment, update cadence and ads 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
Both are free to download. SOLO [Nr.19] sells 1 one-off in-app purchase and DubFilter sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
DubFilter holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: DubFilter has 71 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 67% of SOLO [Nr.19]'s written reviews are positive against 73% of DubFilter's.
SOLO [Nr.19] ships an update every 4 months, DubFilter every 6 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.
| Parameter | SOLO [Nr.19] | DubFilter |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (7 ratings) | 4.7 (71 ratings) — better |
| Positive reviews | 66.7% of reviews | 73.3% of reviews — better |
| Number of ratings | 7 | 71 — better |
| Update frequency | Every 4 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 60 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | apeSoft | Amazing Noises |
Customer experience
SOLO [Nr.19]
DubFilter
In-app purchases
SOLO [Nr.19]
- SOLO [Nr.19] Live PerformanceFree
DubFilter
- Audio Unit Plugin Support$1.99
![SOLO [Nr.19] SOLO [Nr.19]](https://cdn3.appshunter.io/i/Purple211/6a31d15b2c253f592fad85019e11208b/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/512x0w.png)








