# Knorr — Bass Vitalizer > AUv3 audio plugin for adding overtones and intensity to monophonic low-frequency audio. (iPhone/iPad app by Klevgrand Produkter AB.) - Source: https://appshunter.io/ios/app/knorr/id1482079319 (this page in markdown: same URL + `.md`) - Developer: [Klevgrand Produkter AB](https://appshunter.io/developer/1118902192) - Category: Music, Music - Price: $8.99 (on sale, was $9.99) - Rating: 4.20/5 from 5 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 9.3 · 4 MB - Languages: English - Released: 2019-10-14 - Data updated: 2026-06-09 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/knorr/id1482079319/reviews.md ## What is Knorr? Knorr is a plugin that adds intensity and edge to a monophonic low frequency audio source (like a bass). The algorithm adds overtones to an existing sound in a way that isn’t possible with ordinary distortion or filtering. The Knorr Algorithm The underlying algorithm uses a combination of filtering, amplitude- , and frequency modulation to process incoming audio. Although Knorr is developed with bass sounds in mind, it can be used on any monophonic sound source as long as there is audio content available in the low mids (and below). **User interface** XY Pad - Controls the bandwidth and amount of energy sent to the algorithm. Click and drag to move the marker. Range (X-axis) - Sets a low pass filter frequency of the signal to be sent to the algorithm. Spans from 100 Hz to 1 kHz. Level (Y-axis) - Sets the level of the low passed audio content. Bite (SOFT, MEDIUM, HARD) - Alters the amount of intensity of the modulations. Output - Sets the output level. Bypass - Turns the effect on or off. Frequency Response graph - Shows the frequency response of the internal modulation signal. Note that Knorr is a AUv3 only and and needs to be launched via a AUv3 compatible host like GarageBand, Cubasis, Auria or similar. It will not work as a stand alone application. More info, audio samples etc available at https://klevgrand.se/products/knorr ## Key features - Adds overtones to low-frequency audio - Uses filtering, amplitude, and frequency modulation - XY Pad for bandwidth and energy control - Adjustable Range and Level controls - Bite setting for modulation intensity - Frequency Response graph ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/knorr/id1482079319/reviews.md ### 5/5 — Problem solved *2022-11-11* A very simple plugin but highly effective. Instead of having a bass chain stuffed with way too many plugins to get your bass to be heard on smaller speakers this neat one stop does away with all that confusion and CPU overload highlighting those tricky low mids and upper frequencies . Very pleased with this purchase. ### 4/5 — Just by way of balance.... *2021-03-30, version 1.0.0* I like it:) It's not the most self explanatory app in the world and in common with Luxe, it's not immediately clear what it does. It essentially seems like you've got a kind of single band EQ thing going on which you sweep x & y to highlight and amplify lower frequencies, but the blurb mentions filters and modulation things, so what do I know? I do know that there's not an awful lot of information on screen, except for a dancy line thing which sort of make sense in an abstract way. So you more or less have to do it by ear really, which is probably a good thing. Anyway, it punches, it rumbles, it beefs, it booms if you want that sorta caper. I think it's useful for clearing up the muddy mess that can fester right at the bottom end sometimes, giving low rumbles a bit more of a distinct 'source' sound. Worth having imo, but then I did get it on sale. It did seem a bit pricy at full whack I seem to remember... ### 1/5 — .. *2019-11-01, version 1.0.0* I’ve a lot of the klevgrand stuff and I have no issues, most of them very well justify the cost, high end outstanding products, this however, should have been free and I probably still wouldn’t have kept it. Looking forward to an update that takes this pile of sh.! and turns it into a real klevgrand quality plugin.. ### 2/5 — Uh... *2019-10-22* Usually love Klevgrand. This is not moving the needle in any way. Sorry to not be more specific, but pretty bummer plugin. ## Frequently asked questions about Knorr ### What is Knorr used for? Knorr is an AUv3 audio plugin designed to add intensity and unique overtones to monophonic low-frequency audio sources, particularly bass sounds. It achieves this through a combination of filtering and modulation techniques. ### How does Knorr work? Knorr processes incoming audio using a proprietary algorithm that combines filtering, amplitude modulation, and frequency modulation. This creates overtones not achievable with standard distortion or filtering methods. ### Can Knorr be used on sounds other than bass? Yes, while developed with bass sounds in mind, Knorr can be applied to any monophonic sound source that has audio content in the low-mid frequencies and below. ### What are the main controls in Knorr? Key controls include the XY Pad for adjusting bandwidth and energy, Range for low-pass filter frequency, Level for audio content volume, and Bite for modulation intensity. There is also an Output control and a Bypass switch. ### Does Knorr work as a standalone app? No, Knorr is an AUv3 only plugin and requires a compatible host application such as GarageBand, Cubasis, or Auria to function. It cannot be used as a standalone application. ### What is the price of Knorr? Knorr is available for a one-time purchase of $8.99. The app does not feature in-app purchases or advertisements. ### On which devices can I use Knorr? Knorr is currently supported on iPads. It requires an AUv3 compatible host application to run. ### How often is Knorr updated? Knorr was last updated on October 15, 2019, to version 1.0.0. Further updates would depend on developer plans for new features or compatibility. ## Version history (last 1 release) ### 1.0.0 — 2019-10-15 No release notes. ## Apps similar to Knorr | App | Rating | Price | Category | | --- | --- | --- | --- | | [Async Sampler](https://appshunter.io/ios/app/async-sampler/id6453162970) | 4.5 (17) | $14.99 | Music | | [BTS FX](https://appshunter.io/ios/app/bts-fx/id6450247370) | 5.0 (3) | $9.99 | Music | | [Dub Filter - High Pass](https://appshunter.io/ios/app/dub-filter-high-pass/id6478895441) | 5.0 (6) | $14.99 | Music | | [sub808](https://appshunter.io/ios/app/sub808/id6475637520) | 4.1 (9) | $9.99 | Music | | [KA mini DiZi](https://appshunter.io/ios/app/ka-mini-dizi/id6478074079) | 5.0 (5) | $1.99 | Music | | [VAPolyMkII](https://appshunter.io/ios/app/vapolymkii/id6476809566) | 4.6 (11) | $5.99 | Music | ## More apps by Klevgrand Produkter AB - [SquashIt multiband distortion](https://appshunter.io/ios/app/squashit-multiband-distortion/id796836524) - [R0Verb multi delay-line space machine](https://appshunter.io/ios/app/r0verb-multi-delay-line-space-machine/id937195891) - [Svep - phaser, flanger, chorus](https://appshunter.io/ios/app/svep-phaser-flanger-chorus/id940079014) - [Enkl - monophonic synthesizer](https://appshunter.io/ios/app/enkl-monophonic-synthesizer/id968693910) - [Korvpressor](https://appshunter.io/ios/app/korvpressor/id995163144) - [Esspresso](https://appshunter.io/ios/app/esspresso/id1037999669) All apps by Klevgrand Produkter AB: https://appshunter.io/developer/1118902192 --- *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 2026-06-09.*