# JAF Collection — Iconic VA Filter Collection > Analog synthesizer filter collection for iOS with standalone and AU plugin capabilities. (iPhone/iPad app by Jens Guell.) - Source: https://appshunter.io/ios/app/jaf-collection/id1472896422 (this page in markdown: same URL + `.md`) - Developer: [Jens Guell](https://appshunter.io/developer/1195004865) - Category: Music, Productivity - Price: $12.99 (on sale, was $24.99) - Rating: 4.90/5 from 20 App Store ratings · 13 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 12 MB - Languages: American English - Released: 2019-07-24 - Data updated: 2026-08-03 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/jaf-collection/id1472896422/reviews.md ## What is JAF Collection? The JAF Collection is an exciting set of digital modeled classic analog synthesizer filters (VCFs) for iOS. The emphasis of this collection of audio effects is professional analog sounding and optimized behavior with touchscreen usage. The collection is exclusively available on Apple devices. The apps and the included Audio Units are “universal”, so they work on iPhones and iPads the same way and also have basically the same appearance and functionality. Note: These apps are so-called “Audio Units” (aka plugins), which usually require hosting audio applications to operate. Although, they come with their own basic host applications, which include for instance Core MIDI connectivity and microphone input, to use the filters out of the box, like external hardware devices, without requiring another host application. The JAF Collection Filters can also act as a synthesizer module due to the fact, that there is an unison oscillator section (VCOs) built in for testing and for live performances. The analog modeled synthesizer has no advanced controls or modulators. It just runs the oscillators continuously and can be controlled by external MIDI messages to snap to MIDI pitches or being automated with the volume controller. The complete MIDI assignment is documented in the MIDI Implementation Chart for the JAF Collection, which is embedded into the main app. ## Key features - Digital models of classic analog synthesizer filters - Optimized for touchscreen interaction - Standalone host applications included - Audio Units (AU) plugin support - Unison oscillator section for testing and live performance - MIDI connectivity and control ## Recent user reviews (10 of 13) All indexed reviews: https://appshunter.io/ios/app/jaf-collection/id1472896422/reviews.md ### 5/5 — Top filters *2023-08-12* I’ll second the other review. These are really good filters that sound superb. There should be a mountain of positive reviews but strangely there isn’t. I’ve been using this app for quite a while and I’m never disappointed ### 5/5 — Immense *2021-06-20* This massive collection of filters is absolutely essential for anyone interested in extreme sound manipulation and all forms of experimental/adventurous music. On first use, I took a very bland, mid pace drum loop and within 30 secs mangled it beyond recognition. The sonic possibilities of this app are limitless. Don’t sleep on this one. ### 5/5 — Greatest of the filters! *2021-01-25* Latest updates have stopped aum from recalling settings!? :/ any help would be great. ### 5/5 — One of the best filter available for iOS *2020-05-26* This is one of best sounding filters on the ios platform plus the developer is very responsive. ### 5/5 — Best iOS filter I’ve heard *2020-01-17* Jens Guell’s AU plugins shouldn’t sound this good. I like them so much I’ve even put analog gear through them....to make them sound even more analog! Ok, that might sound perverse (it is), but although there have been bugs (which normally get quashed) and although there’s a distinctly quirky interface (which I personally like) I honestly haven’t heard anything like this on iPad. Something that instantly oozes warmth, grit, anlaloguey goodness, and at such bargain prices. The list of filters here are great, to have so many choices of filter is such a luxury, imagine the cost of this in hardware form...! All this would be meaningless if they didn’t sound great. But they do. Very much so. QED. ### 5/5 — Desert Island Filter App *2020-01-17* Underrated dev. I used the free JAF Model One AU so much I felt I owed it to the creator to buy the full version. No regrets! Amazing collection of filters, so many great modelled filters in here, grits everything up nicely & makes everything feel alive. Reminds me a lot of the brilliant Sherman Filterbank I used to have. If you write hard music like Industrial, Grime, etc, you want this. Only thing I’d love to see in the future is some sort of note off or gate for the Oscillator section. Kind of irks me hearing it everytime I load a project using it. When it’s on, it’s just always ON. ### 5/5 — Dream come True! *2019-09-19* I have been hoping for something like this for iOS for a long time. Just the thing to help my synth sound stand out and take care of any harshness. Just WOW! ### 5/5 — Excellent DSP in these filters *2019-08-20* A great range of filters with excellent functionality. They really standout from other filter apps in my experience and are a great value. The updates have improved the functionality of the app in a wide variety of hosts so it’s good to see them supporting their app so well. The latest update significantly improved the visibility of the GUI so you can see it even if your vision is less than perfect. **Developer response:** Thank you very much for the review! We see the contrast problem, so the next version update (1.4) will focus specifically on this problem with a drastic improvement by more consequently adjusting the main color, when using the contrast slider. This was not solved optimal yet. We will realize this with automatic background-foreground color inverting, which works quite good as some internal tests have shown yet. Regarding the small labels, we suggest to zoom into the view temporarily, as we extra for such reasons (readability) implemented the advanced pinch2zoom feature into all our audio units. Once the labels and control positions are known, this should not be a problem any longer. Aesthetically it would be a problem just making all these labels bigger permanently. We tried that already and were extremely unhappy with the result. ### 4/5 — Could be better *2019-08-16* GUI needs work **Developer response:** Thank you for the review! A new update (the fourth) is in progress. We changed several things with the UI multiple times. Unfortunately we cannot read the wishes of the users from their mind, even if the statements are quite generalized and not concrete. However, we see, that there are some issues, and the next release will try to fix such issues, which are obvious to us. The UI is actually the part of the development, that required significantly the most time yet with this. We wanted to go new ways in design and usability of Audio Units with the UI. But such way seems to be quite long and stony. ### 5/5 — Rocks *2019-08-12* Using this on everything. Quick and easy way to get your mix on. Either simply using a high pass to clean up low frequencies or getting into the saturator &/or modulator and reshaping your sounds, this is a great tool for quick, quality filtering. For me, this is an essential app for iOS music production. ## Frequently asked questions about JAF Collection ### What is JAF Collection? JAF Collection is a set of digital models of classic analog synthesizer filters for iOS. It provides professional analog sound and is optimized for touchscreen use, functioning as both standalone apps and Audio Units. ### Does JAF Collection work on iPhone and iPad? Yes, JAF Collection apps are universal and work on both iPhones and iPads with the same appearance and functionality. They are designed for Apple devices exclusively. ### Can JAF Collection be used without another host app? Yes, the apps come with their own basic host applications that include Core MIDI connectivity and microphone input, allowing you to use the filters out of the box like external hardware. ### What is the price of JAF Collection? JAF Collection is available for a one-time purchase of $19.99. There are no in-app purchases or subscription fees associated with this application. ### How often is JAF Collection updated? The latest version, 1.5, was released on February 20, 2023. Updates typically focus on improving functionality and compatibility for iOS devices. ### What is the age rating for JAF Collection? JAF Collection has an age rating of 4+, making it suitable for a wide range of users. This rating indicates general content appropriateness. ### Does JAF Collection have ads? No, JAF Collection does not contain advertisements. As a paid application, it offers an uninterrupted user experience without any ad interruptions. ### What devices support JAF Collection? JAF Collection supports iPhone, iPad, and iPod touch devices. It is designed to run on the iOS ecosystem. ## Version history (last 5 releases) ### 1.5 — 2023-02-20 Updated for native ARM64 support and M1/M2 ### 1.4 — 2019-08-18 1.4. (fourth maintenance update) A. moveable modal boxes we have made the 'modal boxes' for the modulator, oscillator and saturator modules moveable now. the boxes will be ready to be moved freely inside the plugins effective area, if no internal control is hit. the positions are remembered for the current session only, as it would create problems while loading with different host apps due to different window sizes and handling. there can only be one modal box opened at same time for certain reasons, but the positions are individually remembered for each type of dialog while working with the plugin. the global zoom feature affects everything, not merely individual boxes. The move feature can be globally locked with the freeze button. the freeze button will be invoked or hidden by a long press gesture. to close a box, one must tap outside the visible area of the box. the double tap with 2 fingers will reset everything to default positions. B. zooming behavior the model selector (exposed via [ menu ] button) will not disappear anymore by tapping outside, to support zooming while it is open. The menu button must be tapped explicitly to close the menu. if you want to zoom into open modal boxes, you must ensure to pinch inside their areas to make not disappear these automatically. a tap outside will automatically hide any open modal box. this was a requested user feature and we won't change that again. C. improved contrast behavior modal boxes now also support the contrast feature with their own semi-transparent background. we also improved the entire contrast to get really more visual difference. it is done by just inverting the main color in relation to the background color. this should optimize usage with extreme lighting and give entirely more contrast. this also affects all the main labels. D: labels made bigger all the labels of the user interface were made 1 point larger for better readability. this is maximum as it already looks quite clumsy now. ^^ E: removed Bluetooth MIDI connectivity We decided to remove MIDI connectivity features from our releases completely. the reason is, that we always have to provide videos for the app store staff with each update release to demonstrate this iOS system feature with our distribution apps. we have not the time to endlessly capture videos of basic iOS system features, as these system functions are merely invoked by the app, not coded. it is not our code, nor do we even have influence to these mechanisms, so we do not see the logic in the demands of the app store review staff, notoriously asking for demonstrating sub features of our apps, that are in fact features of the OS. So Bluetooth MIDI cannot be established any longer with our distribution apps. it is also not a requirement for the operation of the audio units, b.t.w. F. audio improvements and extension delayed again some audio issues (like hot signals, loudness adjusting, additional comb effects) will come with the next update, as far there is even any interest for that. ### 1.3 — 2019-08-05 1.3 (third maintenance update) A: newdescriptor names the Audio Unit and distribution host app descriptors were changed. the naming of the audio units caused much confusion, as some users were not able to find our plugins after installation. the naming convention of formerly "Filter Model One" and "Filter Collection" are now - "DGST: JAF Model One (AU)" and - "DGST: JAF Collection (AU)" the "DGST:" prefix always marks ALL of our audio units with the unique company identifier. IMPORTANT NOTE : we highly recommend to deinstall the previous version and do a new install therefore! existing projects possibly must be updated with the new instances. B: parameters in AUM especially for AUM, we implemented the "exotic" but ("required") flag for exposing the parameters. otherwise AUM will not publish any parameters, that are not flagged with a special "kAudioUnitParameterFlag_IsWritable" flag. This is somewhat "willful', because other hosts actually listed our parameter tree for automation correctly. ( more info on that in the version history on our product website ) C: several UI fixes the new model selector menu, that came with update 1.2 introduced some new UI discontinuities. sometimes the selector was still (silently) active but visually disappeared. we fixed that. D: toggling the contrast control overlay the contrast button and the adjustor slider can be temporarily toggled with a long press gesture, making it disappearing/appearing again. we hope the new feature will improve user experience. E: the 'pinch2zoom&move' can be locked now we implemented a new 'freeze' button aside the contrast feature, that temporarily disables zooming and moving the interface. this button will also appear/disappear with the long press gesture. F: there was a (possible) problem, using multiple instances with differing zoom adjustments. we fixed that. G: gesture recognizer slightly changed the previous implementations required to touch exactly inside the visible area of the user interface to be recognized. now all gestures are recognized on the entire window area of the audio unit's interface, which is much more logical and intuitive to use. H. audio engine update delayed some audio issues (like hot signals, loudness adjusting, additional comb effects) will come with the next update. ### 1.2 — 2019-07-27 1.2 (second maintenance update) this update fixes mainly functional issues with the Audio Unit application programming interface. A. exposing AU parameters we implemented an extra function to (additionally) expose main parameters to the hosts. notes: there are unclear issues reported with some host apps, not exposing our audio unit parameters at all. this is quite strange due to the fact, that any audio unit per default implements a so-called 'parameter tree', that can ( and actually * must * ) be iterated by any host app to receive all that parameters of a designated audio unit. our units did and * still do * implement this parameter tree. the distribution app even uses this internally, because this app is basically a minimal Audio Unit host, nothing more and nothing less, working with ... guessing what? ... well the ominous parameter tree. So basically, we do not understand, why some hosts are not able to just expose our published audio unit parameters. However, we now use an additional interface function to expose at least the main parameter to the host application with this release. AUM for instance exposes this published "main parameter" of the unit successfully (with 'aufx' types at least), but on the other side, it FAILS to list our parameter tree !? that is absolutely un-logical and must be an issue in that host apps. B. AU parameter automation (which by the way, depends heavily on the bespoken 'parameter tree' above) our JAF and JAX series were initially planned to behave and be used like classic external hardware devices, so we concentrated to MIDI implementation but ... parameter automation should now be possible. there was a missing link, that prevented our units to pass thru parameters from the host inside the rendering block. such usually happens, if the hosts do so-called "parameter automation". Although, many different host applications do implement this feature obviously differently and as long this is the case, we cannot guarantee the functionality of our plugins with these hosts right now. so try, before you buy! The simple fact, that our units can receive MIDI messages and translate these to parameter changes in realtime proves, that the parameters actually can be automated with the internal mechanisms successfully and out of the box. we tested the new parameter automation with Cubasis very successfully. all parameters were recorded and also shown with their correct names from the parameter tree! playing back with parameter automation actually was moving (remoting) the designated controls visually as expected! C: UI corrections and extensions the push buttons are somewhat bigger now but not much. we felt, it tends to become very ugly if these buttons are much bigger. the button labels are also somewhat lighter now. (but wait, for what the heck, did we actually implement pinch2zoom&moving for you, User ???) if you can't read it, just zoom it! the 'modal 'boxes' (which by the way are vector graphic overlays and not 'views') will now automatically disappear, if the user does not us a control inside them actively. So there is no need to click the button again to make this (dis)happen. but these will now also disappear, if a user accidentally passes to hit a controls area inside these boxes, which now may produce just other confusion ... we will definitively not implement any popup menus or similar for the model selector slide button as seen so often in audio apps. theses will lock the screen and the access to the u! that is an unacceptable behavior while working with plugin- and audio interfaces in general. if you want this, so please look for such things anywhere. there are loads of apps that implement this (dis)functionality for you! ... the full list was cut here due to insufficient space ... (you may read the full list of changes on the product/support website.) ### 1.1 — 2019-07-23 1.1 (first maintenance update) A. we changed the touchscreen behavior to be much more intuitive and obvious. - resetting the view with double tapping requires now 2 fingers (previously 1). it was too easy to accidentally reset the view, when doing fast tapping - causing confusion to the users. - moving the view now works as expected with 1 finger (previously 3 fingers were required), if no control is touched, the view will be ready to be moved freely, but touching controls will lock the view moving automatically. this behavior is entirely much more "intelligent" and natural. - pinch 2 zoom works as before, but we optimized the performance with all the moving and zooming. - for performance reasons we disabled any easing animations (eye candy :: versus app and audio performance) B. the background color layer was not resized correctly, when the audio units were loaded into several hosting apps. - we changed this behavior but we are still not sure, whether this will work with all possible hosting apps. please report! note: our audio unit views are self resizing. additionally you can zoom and move the internal views inside the container view freely. We certainly cannot test all available audio unit host apps, to check this behavior everywhere. if a view seems to be disappeared suddenly, so please use double tapping with 2 fingers to reset the view to default state. this should center and size-fit the view to its defaults (fitting view width to screen). C. the maximum view width for zooming is now limited to 2048p, minimum is 256p. - larger scaling does not improve the usage and has a deep impact on the graphics performance and also it is obviously merely confusing to the user. note: view positions are no longer saved as user defaults. we discovered that loading the audio units in to different host apps, produces massive problems with the saved view positions. all possible hosts have different view sizes and container 'window' behavior, that may conflict with any such saved user defaults. D. re-enabled the bluetooth publishing with the JAF Collection and JAF MODEL ONE. - we switched this feature temporarily off, because of some problems and unacceptable delays with the app store review process. the (additional, optional) feature was carefully tested by us and works without any problems. E. the emphasized color for the last filter type (pass thru) was grey. we changed this to green, because the control positions were not easy to recognize the other way. F. the contrast of some knobs was slightly changed. G. the auto-scaling of the parameter changes was changed, especially the filter type selector. - parameter change speed is now more intelligently connected to the current zoom value, that means, the smaller the view is, the faster the controls will change and vice versa. this may be very handy with parameter automation and live performances, where users may optimize the access to selected controls. H. the contrast button was placed more on top of the screen to not to conflict so much with the user interface. I.the documentation and the website resources were reworked. an official email support link is now available. J. New modulation destination was added (exchanged) on both JAF versions (paid and free version). instead of an amp modulation (which basically was a modified form of ring modulation), now a (Bode-alike) frequency shifter was added. this complete new effect can be used without the filter in "pass thru" mode as some of the other modulation destinations and the saturation unit, which are connected serial prior the final brick-wall limiter. K: the frequency labels of the cutoff wheel did show wrong values, we corrected this. next update will concentrate more to the sound. we highly encourage you to contact us, if you've found any issues. ## Apps similar to JAF Collection | App | Rating | Price | Category | | --- | --- | --- | --- | | [RingsFX](https://appshunter.io/ios/app/ringsfx/id6478013769) | 4.9 (26) | $14.99 | Music | | [Things - Flip EQ](https://appshunter.io/ios/app/things-flip-eq/id6470745211) | 4.9 (8) | $6.99 | Music | | [BLEASS Fusion](https://appshunter.io/ios/app/bleass-fusion/id6451042791) | 4.8 (17) | $9.99 | Music | | [Auto Fills Drum Fill Generator](https://appshunter.io/ios/app/auto-fills-drum-fill-generator/id6476319733) | 4.5 (20) | $5.99 | Music | | [LFOH!](https://appshunter.io/ios/app/lfoh/id1609270466) | 4.7 (18) | $3.99 | Music | | [BLEASS Multiband Compressor](https://appshunter.io/ios/app/bleass-multiband-compressor/id6478235964) | 4.7 (13) | $7.99 | Music | ## More apps by Jens Guell - [GM MIDI Player](https://appshunter.io/ios/app/gm-midi-player/id1445780869) - [MIDI SWEET : Clock Sync (AU)](https://appshunter.io/ios/app/midi-sweet-clock-sync-au/id1454284852) - [JAF Model One](https://appshunter.io/ios/app/jaf-model-one/id1472652593) - [JAX Stereo Tool (AU)](https://appshunter.io/ios/app/jax-stereo-tool-au/id1473390302) - [JAX !Make Louder (Audio Unit)](https://appshunter.io/ios/app/jax-make-louder-audio-unit/id1474614677) All apps by Jens Guell: https://appshunter.io/developer/1195004865 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-03.*