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When controlling the Mic PreAmps of Horus/Hapi, the gain steps are 3 db.
Low-cut, PAD, Phase Invert, Phantom, input type selector are not working.

• If you are not using a Merging DAW, if you use Avid MicPre protocol to control the preamps, that is normal, as Avid MicPre only works with 3 db Steps.
  Merging has made several improvements, make sure you use firmware v3.0.3b26178 or above.
  In most circumstances it is better to enable the ProTools MicPreamps option "Retain the current Setting" under the Peripherals in order not to loose MIDI Pre communication

  Pro Tools on Mac :
  Horus / Hapi / Anubis analog preamps can be controlled directly from within Avid Pro Tools
  running on a Mac. (using Virtual Audio Device Premium). In order to set Pro Tools up for Horus
  / Hapi / Anubis preamp control follow this procedure:

  • 1. Check the Horus / Hapi / Anubis firmware version and update if necessary, to the latest
    version.
    
    

  • Connect Horus / Hapi / Anubis to the system running Pro Tools through the Ethernet port.
    Within Pro Tools

  • Launch Pro Tools and configure to work with RAVENNA Core Audio I/O.
    
    

  • Open Pro Tools Setup>MIDI>Input Devices…

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  • Enable the Merging RAVENNA interface (Horus, Hapi or Anubis).
    
    

  • Open Pro Tools>Setup>Peripherals Settings.
    
    

  • In the Peripherals panel select the Mic Preamps tab:

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  • Select in order: 
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• If you are using Merging DAW, make sure you use the firmware related to your Pyramix version:

...

 See also Horus / Hapi IO Cards compatibilities for additional cards firmware compatibility.