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Input + Gate .... " Level Setting " .... can this be used as an Analog-Stage Guitar Input Pad ?

Discussion in 'Axe-Fx II Discussion' started by ben ifin, May 2, 2017.

  1. ben ifin

    ben ifin
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    Hey all

    Ive got some FW 8 presets where I would like to apply a pre-AD [ Analog Input Stage ] Pad to my guitar input signal .....

    So I noticed in the " Input + Gate " Page in Axe-Edit that the Gate has a " Level " setting ...... however I dont use the Gate - I run the " Threshold " on OFF - .... so my question is:-

    => if I keep the Gate Threshold OFF, but I set the Level to [say] - 4 db ...... will that Pad the incoming Analog Guitar Input by -4 db (?) -or- does that Level control only exist in the DA-side of the unit ?


    I had initially thought I could put a Vol or Filter Block and set it to -4db but I figured as that block would be in the "grid" that it would be operating in the DA-side of things too and therefore it would not Pad the analog guitar input (?)

    Hoping this makes sense.

    Thanks,
    Ben
     
  2. FractalAudio

    FractalAudio
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    No, everything on the grid, including the Input and Output blocks, are after the A/D. The Input Trim control in the I/O menu is before the A/D. You can use that to reduce the level into the A/D.
     
  3. ben ifin

    ben ifin
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    Thanks hugely :)

    -> as in the " INSTR IN " that ranges from %0 <-> %100 (?)

    -> I run mine normally on %24.3 ........ is there a way to roughly calculate what % figure I would need to drop too for [say] a 4db cut (?)

    Hoping I am understanding this correclty

    Thanks again,
    Ben
     
  4. FractalAudio

    FractalAudio
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    10^(G/20)
     
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  5. ben ifin

    ben ifin
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    :) :( Mind officially blown for reasons that I know not :) :( .... help ... please ...??

    Ben [ duly qualified but lapsed Economist ] Ifin
     
  6. #6 FractalAudio, May 2, 2017
    Last edited: May 2, 2017
    FractalAudio

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    If you want 4 dB of gain reduction:
    A = 10^(-4/20) = 0.63
    So you need to reduce your input pad by 37%. The new value is 0.243 * 0.63 = 0.153 => 15.3%
     
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  7. ben ifin

    ben ifin
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    Just. Wow. Thanks !!!
     
  8. Wolfenstein98k

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    Hi! May I ask why you want to lower your signal going into the A/D?
     

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