Flanger is an effect. I can't see any input signal in first place - unless it's supposed to be sine? If yes, it certainly won't work as effect makes sense only for wideband signals.
For it to make any sense, the delay needs to be variable - here is static. In fact you should have LFO modulating the delay amount and sum it with undelayed signal. In the example above both signals feed different inputs and don't sum at all.
Here's some quick fix. No idea how to connect midi-controlled knobs, though.
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