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well,

I think you can only have one way or the other; having both ways (WS MIDI Clk out -> qtractor -> WS MIDI Clk in) is not really an advisable situation...

iow. if you set qtractor's MIDI Clock option to "Duplex" you better not make both source and target as being the same device, otherwise you'll probably get a positive feedback loop and end up with a proverbial undefined behavior, which I think you already noticed :)

hth.
cheers