FWIW, Johan, try recording your new track totally without regard to the original stereo track then drag it into the mix lastly. Its probably the Irish way but its a workaround for what you describe. If you have separate tracks then you can drag n drop wherever. Good thing that I speak a bito' Canadian, eh?

Are you a steer, or just Bovine droppings?

Headin' fer the oothoos...