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Helix vs Digitech GSP1101 volume


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I have a Helix rack and am suing it exclusively for FX. Up until I got it, I had been using the GSP1101. There is a big volume difference between the two. Say I am running the master on my amp at 12:00 and then using 4CM, I have to run the Helix around 1:00 to get any gig volume. On the GSP I only have to run it around 10:00 to get the same volume. Is there a reason for this or am I doing something wrong?

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GSP1101 line level is 23dBu FS, Helix (line level) is 18dBu FS.
It should not bother you because Helix Volume Knob is a digital attenuator (before DAC) so turning it counterclockwise deteriorates SN ratio.
And yes you can also do something wrong in setting levels and keeping too big headroom.

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