I would suggest making different lists that are dependent on what application you are using. You can make a list for your guitar amp sounds, and another list for your DAW/outboard sounds.
If using the H90 100% wet in a DAW/outboard setting, you can turn Kill Dry on and this will remove the dry signal. The full sweep of the mix knob will be determining the level of the wet signal.
When Kill Dry is off, the mix knob will act as a balance between the wet/dry signal, and will mix out the wet or dry signal at either end of the knobs value.
At 0 it will be 100% dry, at 100 it will be 100% wet, at 50% it will be 100% dry + 100% wet.
Note that there are also Program and Preset mix levels, and this will give you another range of how you can balance your signal.
For example, if Program mix is at 50%, and Preset A mix for SP2016 is at 100%, you can turn the output gain of Preset A down and this will just turn down the volume of the reverb since you have the dry signal from the Program mix.
Let me know if that helps.
