Something else we do a lot of. Scratchy vinyl, old shellac 78rpm records, hissy tapes, etc etc. We can usually scrub them up (perhaps not quite literally...!) to sounding close to, if not absolutely pristine. We have techniques to repair physically broken and/or otherwise unplayable records and tapes, including cassettes and even DAT tapes. Recordings which have been marred by unexpected and unwanted extraneous noises can be salvaged, and we can often repair clipped audio using specialist software. On occasions we've even done forensic audio work.