Ok, there are two possibilities:
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You might have it setup the wrong way around. Scaler is acting on the MIDI signal so it should listen to the MIDI input (for example: piano roll or MIDI controller) then you redirect Scaler’s output to your synth.
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There is also the possibility that I misunderstood what you are trying to do and this is just related to an issue with the VST3 in FL Studio where Scaler doesn’t redirect the MIDI properly. Try with the VST2 version.
Have a look at this thread: MIDI Routing - FL Studio - VST3