Using 2 and multiple channels together in the Effect Slot

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Can't we use the Effect Slot channels more than 2?

Apparently, custom nodes with more than 2 channels cannot be opened loaded to the HardcodedMasterFX unit in the Effect Slot (which supports 2 channels only).

I have a sidechain comp with 4 channels. But at the same time we also need to be able to swap this with 2 channel effects.