Acoustic IR sounds great, if you can

Discussion in 'Discussion' started by Chalky, Jun 10, 2020.

  1. Chalky

    Chalky Well-Known Member

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    Hello, after inserting a 3Sigma D45 IR into the Cab block, and using a DLuxe as a neutral amp, I get one of the best acoustic simulations I have heard from a piezo pick up .... BUT....... the signal strength is so small that I have to whack up all the gain stages which just doesn’t feel right.

    So what am I missing here?
     
  2. Jace Nuzback

    Jace Nuzback Senior Member

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    There's nothing wrong with boosting levels to match other patches for this kind of use.
    You should be able to do most of the boosting on the CAB block LEVEL parameter.
    What parameters are you currently boosting?
     
  3. Matt

    Matt Well-Known Member

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    I found the same (minor) issue with piezo acoustics and accoustic IRs. I don’t use a pre-amp model, but I think I used the KT88(?) power amp and also an EQ block to boost the levels up. A little compression is nice with these and you can boost in that block as well.
     
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  4. Chalky

    Chalky Well-Known Member

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    I contacted Sigma (they are very helpful) after explaining how i'd set up inc' screenshots. I was using the IR in Logic Pro at the time to assess the signal strengths using metering, and had to use the Gain utility to get a decent waveform that I could see but also explaining that the live stage use required worrying amounts of mixer oomph .. they said:-

    "You're using them correctly. IR loaders were initially designed to load guitar speaker cabinet impulses and reverb impulses. Because of this the normalization algorithm that determines how loud the output signal is tuned for these. Acoustic impulses have significantly more treble content than a guitar speaker cabinet so the IR loader outputs them at a much lower volume. You aren't degrading the signal at all by adding back clean digital gain. So feel free to boost it as much as needed. One note you do not want to add analog gain like with the Scarlett. That will cause noise and or clipping. You should set the input level for the Acoustic DI with no impulse applied and add back the volume with a clean digital boost in the computer." ...

    OK, that explains the physics of it, so acoustic IR's are lower, but even with all digital levels pretty much max'd you still have to use a lot of gain on the mixer .. it works, kind of, but it just doesn't feel the right thing to do! I tried compression but it muddies up the low end into a nasty buzz, so I have avoided that.

    NOW HERE"S SOMETHING ... I have both AF12 and AFB, and the AFB signal is far weaker than the AF12 using the same imported IR and same level settings. In Logic Pro the delta measures not far south of 15dB in my configuration. I just realised this is presumably because whereas you can whack up LEVEL in the CAB block on AF12 there is no LEVEL to see in the CAB block in AFB. I am now wondering if this is a limitation of AFB where Acoustic IRs are concerned.

    What think you?

    I have screenshots but for some reason the Upload a File is greyed out today, almost as grey outside.
     
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  5. Jace Nuzback

    Jace Nuzback Senior Member

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    All of the EQ blocks can be set to GAIN ONLY. This allows you to use them as nothing more than a level boost when needed.
    You can also use the Compressor block just for gain. Leave the Threshold all the way up and the Ratio all the way down.
    Make sure MAKE UP is set to OFF. Then use the Compressor LEVEL parameter to boost the level.
    These options should give you PLENTY of gain for any acoustic preset.
     
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  6. Chalky

    Chalky Well-Known Member

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    Jace thanks for that, I’ll give it a go tomorrow, i was hoping to dedicate my AFB to acoustic, so if this works it would be brilliant, and save money!
     
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  7. Chalky

    Chalky Well-Known Member

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    It works, and once again many thanks Jace, I would never have thought that. I am especially please because the results I get from AFB+IR are way better than any of the Fishman, Baggs, Boss pedals I have thus far tried for faithfully replicating a lovely woody acoustic guitar. It's a good day :)
     
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  8. Jace Nuzback

    Jace Nuzback Senior Member

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    That's excellent!
    And thanks for the kind words.
    We need to get this message out to acoustic players!
    Jace
     
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  9. mnewse

    mnewse Active Member

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    Thank you for bringing my attention to these, I'm buying a couple now.
     

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