Does anyone have a suggested method/routine/process for achieving unity gain on the HX Stomp?
Can you clarify, do you mean maintaining good gain staging throughout the modules in a preset, or maintaining similar relative output levels among presets?
If you mean the former (
gain staging), the lack of internal metering necessary to do so is a common complaint among Helix users. Line 6 have offered some hope in saying that the shift of all units to the Helix Core firmware code base, and the optimization that brings, may allow the introduction of metering at some point in the future. Until then, I think we just need to be sensible in our module settings, and use our ears.
If you mean the latter (
relative preset volumes), I can outline my process. Like @Jehos, I too make certain that the only volume controls in use are within the preset in order to ensure there is no variance on what is sent to FOH. (
It removes the temptation to bump the volume knob in escalating stage volume wars.
)
To set the relative preset output levels, I have a project in my DAW (Logic Pro X) that has a clip of me playing 1/8 notes at E2 with a moderately strong attack using a pick on my bass ('78 Fender P) directly into my audio interface with no pre-amp boost. My recording levels wind up being around -26 dB, which is kind of low; but my intent is to have a "natural" bass guitar signal, as opposed to optimizing the signal/noise ratio.
I then loop the playback of this clip, and send it into the Stomp via the USB Output ports 5/6 to re-amp it through the various presets I am tweaking. I receive the incoming re-amp'd signal from the Stomp into another track via the Stomp's USB Inputs 1/2. I mute the original (source signal) track, and monitor the incoming (re-amp'd signal) track.
I adjust the parameters of the patch as necessary to get the full output level around -12dB. I may tweak amp channel/master volumes, mic models/proximity, any compression, or simply adjust the output level for the patch: whatever works best. Once, I get it around -12dB in level and sounding good, I compare it to other presets to make sure it sounds around the same apparent volume. Depending on the overall tonality, different presets can sound louder or softer; e.g. a chorused or distorted preset may lose some of its bottom end, whereas a "fridge" cab with a boomy condenser mic may sound louder.
So, the re-amped track level gets me close, then I season to taste.
Hope this helps.