There might be a ground-loop or the gain-staging is not fine. My Dwarf makes absolutely no noise, so, this is doable.
The ground loop can be avoided by using another power supply. Please check this.
The gain staging: Please take care that also the gain staging between the single effects is fine, not only at the beginning or the end of the pedalboard. Try to turn gain down and try to balance it properly in the effect-chain.
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