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For some reason only on the left channel has a thick discolored line going through it.. it also shows up in the main output window.. but the right channel plays 100 percent and no issues.. using a ttm57sl and scratch live 2.5
It's the EQ controls activating MixEmergency's Mixer FX. To disable this:
1) In the menubar select Window, then Mixer FX.
2) On the Mixer FX window that opens, disable all of the pink and yellow buttons.