Master EQ Gain (via SPDIF) without affecting tonal quality

[4Andy]

Hi, does anyone know how to increase the Gain of the Triton output in a uniform way via SPDIF? The Volume control doesn't affect the digital SPDIF out, and I need to ensure uniform boosting across the entire spectrum, to get the best possible signal when re-sampling or recording digitally in Cubase. The Cubase faders don't seem to boost the level by much, although I could add a gain in Cubase, but I'd prefer to boost the signal at source anyway for better quality. I would expect to be able to set the Triton Master EQ Cut Off frequency of the High and Low bands to the same value, e.g. 500Hz and increase the Gain level for both, but not use the Mid Gain by keeping it at zero. However, using this method seems to introduce tonal changes and that is what I want to avoid.