This combo unit lets you copy VHS tapes to DVD (and vice versa) and watch either format from a single device.
Panasonic is among the many manufacturers that now make combo VHS/DVD recorders; one of their current models is the DMR-E75V. This unit includes a VHS hi-fi VCR and a DVD drive that records on DVD-RAM and DVD-R discs (but not on DVD-RW), and it plays these formats, as well as DVD-Video, CD, CD-R/-RW (recorded with either normal CD or MP3 audio), and videoCD. It can even play DVD-Audio discs, but it only outputs two channels. I found out that playing DVD-Audio involves some sort of downmixing, but I was unable to get any more specific details of the process.