# M/S Processor > iOS Mid/Side audio signal processor for professionals with encode, decode, and inline modes. (iPhone/iPad app by Ruben Nine Blanco.) - Source: https://appshunter.io/ios/app/ms-processor/id679279744 (this page in markdown: same URL + `.md`) - Developer: [Ruben Nine Blanco](https://appshunter.io/developer/499300183) - Category: Music, Utilities - Price: Free - Rating: 4.25/5 from 4 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 8 MB - Languages: English - Released: 2013-07-31 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/ms-processor/id679279744/reviews.md ## What is M/S Processor? M/S Processor is an Inter-App Audio and Audiobus-compatible iOS application intended for audio professionals requiring Mid/Side (M/S) signal processing. Functionality While the most common use case for M/S Processor is decoding a M/S signal to L/R, the reverse process (encoding L/R to M/S) is also possible. A third mode, inline mode, is also included. In this mode, a stereo signal is encoded to M/S, and then decoded again to L/R. This 2-in-1 mode is useful for tasks such as narrowing or widening the stereo image, or muting the M or S channels independently for creative or experimental purposes. Inter-App Audio and Audiobus M/S Processor is most useful when used together with other Inter-App Audio or Audiobus-compatible apps to process any stereo or M/S audio signal. Main Features • Supports MFi or CCK-compatible audio devices with at least 2-input channels • Supports Inter-App Audio and Audiobus (acting as a filter) • Encode, Decode, and Inline processing modes • Peak and RMS metering for input and output channels with peak overload indicator • Gain (-48dB to +24dB) rotary controls (per channel) • Linked Gains button • Swap Channels (M to S, L to R) button • Mute, and Phase Rotation buttons (per channel) • Hi-res Retina graphics ------------------- Please consider rating or reviewing M/S Processor after each update to help us further develop our app. ## Key features - Mid/Side (M/S) signal processing - Encode, Decode, and Inline modes - Inter-App Audio and Audiobus compatible - Peak and RMS metering - Gain controls with mute and phase rotation - Supports MFi or CCK-compatible audio devices ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/ms-processor/id679279744/reviews.md ### 5/5 — Really good app *2018-08-01, version 1.8.4* I’m new in this apps for musical production, and now I know what is M/S processing this is really good app for what I Do! ### 2/5 — How Do I Shut It Off When Finished?? *2017-07-27, version 1.8.3* I pretty much like this apps functions. BUT, there is no simple way to shut it off when done using. When, I am done using the screen shows that M/S Processor is still recording. Because of this, I can't use it as is. There needs to be a shut off button. OR, there needs to be posted instructions as to how to shut it off when finished. **Developer response:** Hello bikdav, The reason our app shows as recording is because it has the ability to keep processing incoming audio while it is in the background. If you do not longer need to process any incoming audio, feel free to close the app by double-tapping on the home button and then swiping up. Hope this helps! :-) ### 5/5 — Excellent app for my particular need *2017-02-11, version 1.8.3* I score music for film and TV, and I often need to transcribe dense music because a score is not available. I thought using an mid side decoder could help remove some extremely loud percussion that seemed to wide in the stereo field. No matter how good your ears are, when a mix includes orchestras recorded in large rooms, overdubs of drum machines, sound fx, and there all sent through a final artificial reverb, and you might have to transcribe through an iPhone or iPad speakers, help is welcomed. I found this MS decoder and used it as an AudioBus effect and was amazed how effective the different modes were at very clearly revealing instruments that were practically undetectable while removing other instruments that, while listening in stereo, made exact transcriptions near impossible. Each mid and side of the three distinct modes revealed something new. The app is free and stable. I owe the developer a thank you for making my job easier, and saving me time in the process. That's worth 5-stars. **Developer response:** Thank you very much! ### 5/5 — Whoa! ----> Amazing app! *2013-10-18, version 1.1* Finally, I got this app. Fooling around with it for about 10 minutes or so. The stereo inline mode was fantastic (sound better than the source). I will use it more often along with AudioMastering app. ## Frequently asked questions about M/S Processor ### What is M/S Processor used for? M/S Processor is an Inter-App Audio and Audiobus-compatible iOS application designed for audio professionals to perform Mid/Side (M/S) signal processing. It can decode M/S signals to L/R, encode L/R to M/S, or use an inline mode for tasks like narrowing or widening the stereo image. ### Does M/S Processor work on iPhone? Based on the provided data, M/S Processor is listed as supporting iPads. It is not explicitly stated to support iPhones, but compatibility may depend on specific device models and iOS versions. ### What are the processing modes in M/S Processor? M/S Processor offers three main processing modes: Decode (M/S to L/R), Encode (L/R to M/S), and Inline mode. The inline mode encodes stereo to M/S and then decodes it back to L/R, useful for stereo image manipulation. ### Can M/S Processor be used with other music apps? Yes, M/S Processor is designed to be used with other Inter-App Audio or Audiobus-compatible apps. It acts as a filter within these environments, allowing you to process any stereo or M/S audio signal. ### What kind of metering does M/S Processor offer? M/S Processor includes peak and RMS metering for both input and output channels. It also features a peak overload indicator to help manage audio levels and prevent distortion. ### How often is M/S Processor updated? The latest version of M/S Processor is 1.8.5, which was last updated on August 21, 2021. Users are encouraged to rate or review the app after each update to aid further development. ### What is the age rating for M/S Processor? M/S Processor has an age rating of 4+. This indicates it is suitable for users aged 4 and above, suggesting no mature content is present. ### Is M/S Processor free to download? Yes, M/S Processor is available for free. The provided data indicates its price is 'Free', and it does not list any in-app purchases. ## Version history (last 1 release) ### 1.8.5 — 2021-08-21 • Updated draw engine. • Updated audio engine. • Added missing app icons. ## Apps similar to M/S Processor | App | Rating | Price | Category | | --- | --- | --- | --- | | [TB ReelBus](https://appshunter.io/ios/app/tb-reelbus/id1482450479) | 4.9 (45) | $8.99 | Music | | [RRS EQ173](https://appshunter.io/ios/app/rrs-eq173/id1636444874) | 4.9 (20) | Free | Music | | [Sound Weaver](https://appshunter.io/ios/app/sound-weaver/id1194964172) | 4.3 (18) | Free | Music | | [EQ550b](https://appshunter.io/ios/app/eq550b/id1507176549) | 4.8 (13) | Free | Music | | [AUFX:Space](https://appshunter.io/ios/app/aufxspace/id665650685) | 4.8 (29) | $4.99 | Music | | [AUFX:PeakQ](https://appshunter.io/ios/app/aufxpeakq/id781852954) | 4.5 (26) | $4.99 | Music | ## More apps by Ruben Nine Blanco - [Vectorscope](https://appshunter.io/ios/app/vectorscope/id735257507) - [QR Wizard: Code Reader & Maker](https://appshunter.io/ios/app/qr-wizard-code-reader-and-maker/id1626149466) All apps by Ruben Nine Blanco: https://appshunter.io/developer/499300183 --- *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 2026-06-10.*