Don't know if this is the right section but - I am currently transferring videos from my JVC SVHS VCR to computer. I noticed that any sounds, speech etc are accompanied by underlying 'purring' or low frequency 'flutter' which is in relation to the volume of recorded sound. When there is no sound there is no purring but the louder the sound the louder the purring. Its not horrendous but just 'annoying' - anyone experienced anything like this before? Seems to have occured whilst transferring older 8mm and hi8 footage to the VCR VHS tapes.