I have some old VHS recordings of old television shows, and I just wondered if there’s a way to clean up/improve the quality of the picture? Either in MEP or VPX.
Jak, "cleanup"/"improve" is a very subjective thing. If you're talking about noise reduction, Neat Video is great, although it costs. It comes as a plugin for Magix and works seamlessly with Magix movies.
Otherwise, there are the colour correction effects, the Brightness/Contrast-Gamma effects and Sharpening effects.
Also, if your VHS recordings are Interlaced, set your movie to twice the files' frame rate and set the Object video properties to the correct field order to get good deinterlacing and smoother movement for MP4 exports.
Post a couple of screenshots of your captures and we can point out what could be improved.