Hi eklon.sousa,
In general, it’s best not to use Kill Dry for serial signal paths. Kill Dry should be considered any time there is a parallel signal path, either within the H90 through a parallel routing mode, or when using the H90 as an external effects processor via an auxiliary bus in live sound or recording. In parallel configurations, we’re essentially doubling the dry signal present at the split point, so if one of the effects in parallel is not used in Kill Dry it can be challenging to make level adjustments because of the doubling of dry signal present. This is where using kill dry on a preset basis makes sense. I would only ever use the global kill dry when using the H90 as an external wet time-based effects (delay/reverb) processor for live or recording. Hope that clarifies when to best apply kill dry.
