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zolko60 posted a topic in HelixI have almost sorted out what is going on with Helix input and output levels by my and my friends research. The professional standard for line level audio signals is +4dBu. If we assume 15dB headroom to full scale digital level (0dBFS) is the standard Line 6 has adopted then Helix has three level settings: Line level: +19dBu full scale (+4dBu reference with 15dB of headroom) Instrument level: +11dBu full scale (-4dBu reference) Mic level: +8dBu (-7dBu reference) The pad on instrument input labeled "Guitar In" is 5dB so padded input is +16dBu full scale. Hx FL/RA "Aux In" is just another line level input. The Volume Kob is a digital attenuator assigned before chosen DA converter(s). Now let's see what is happening when we interface Helix with Yamaha MG06 mixer by XLR cable: Let's input -4dBu sinus signal to Guitar Input. It will appear at Hx XLR outputs set to mic level as -7dBu. MG06 mic preamp gain range is 20-64dB. At minimal gain position we get +13dBu. Getting unity gain is not possible without engaging mixer 26dB pad. Using DI box is better because they usually attenuate an amplitude by 18-20dB (plus some padding). -4dBu input signal appears at Helix XLR or TRS outputs set to line at +4dBu. After DI box -14dBu. At min mic pre gain we are near the unity. What I don't know is if Hx FL/RA mic input is set to the same mic level standard (0dB gain=-7dBu reference with 15dB of headroom=+8dB full scale). I would appeciate if somebody could confirm that. Thank you for your attention and research cooperation. :) Yamaha MG06 manual http://shopwl.com/content/MG06 Mixing Console - Manual.pdf