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M/S Processor

Mid-side Decoder by 9Labs
M/S Processor
M/S Processor M/S Processor
M/S Processor by 9Labs is a Mobile Audio App and a Standalone Application for iOS. It functions as a Standalone Application.
System Requirements
- iPad 2 or later
- iOS 7.1 or later
- MFi or CCK-compatible audio device with at least 2-input channels
- Audiobus app for iOS installed (if Audiobus integration is required)
Stand-Alone Utility / Application
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M/S Processor is an Audiobus-compatible iOS application intended for audio professionals requiring Mid/Side (M/S) signal processing.


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.

Audiobus Integration

M/S Processor is most useful when used as an Audiobus filter. In this case, M/S Processor can be used to process audio before feeding it into any other Audiobus-compatible audio application such as Apple's Garageband for recording and further processing.

Main Features:

  • External audio and Audiobus input.
  • 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 ↔ S, L ↔ R) button.
  • Mute, and Phase Rotation buttons (per channel).
  • Hi-res Retina graphics.

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