I hate to sound smart but you can easily buy a voice recorder for cheap
or an mp3 recorder (hell if you have one they might have one there i
know mine does) or a mini disc recorder if your so incline.VHS sound
quality deteriorates quickly,after a few plays it would be starting to
go funny.Also with the first two you dont need to buy any medium maybe a
USB drive if you want it to be completely portable.

Yours truly
Adam