I'd do: Octave>Filter>Comp>Dirt>Chorus (tuner 1st or last, doesn't matter)
Filters and octaves IME usually want a good strong signal sent to them, so those go up front. I prefer to have a compressed sound going into dirt rather than my dirt get further compressed...so comp before dirt. Time based stuff always go last...
If you use the filter and the dirt together experiment with their order. Dirt>Filter or Filter>Dirt. See which way works better for you, especially if you're running them with the octave for a synthy tone.
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