Q: Mixing cable for Mega CD

I know that the mixing cable that's supposed to go from the MD headphone-jack to the Mega CD mixing-jack.

But can I just plug them in directly? Or do I need to put resistors between the jack-plugs.
The mixing cable should just be a standard audio mix cable. You should be able to buy one at radio shack, or make one yourself fairly easily.
ok, another question then...

I want to make a SCART cable for my MD1. The MD1 only has mono sound output so I figured I'd connect the stereo-output from my mega cd to the scart-cable.

When I'm playing with just the megadrive, do i still have stereo-sound?