Hi, i don't know if this is the appropriate forum, tell me if not (i would then be gratefull for any orientation about where to post the thread).

I catched to a digital file a cassette that has a clear and i don't know if perhaps common fault: at intervals of 2 o 3 seconds, the sound appears attenuated for a second fraction, or something like it would be losing highs. It's an effect of the irregular running of the tape magnetic ribbon. I have uploaded a sample at http://www.esnips.com/doc/39651aec-8079-47...2/FailureSample.

Perhaps there's some tool in software like for example Sony Sound Forge or other audio editor, that fix or attenuate this fault if it's an audio effect commonly identified.

Thanks in advance for any help.

I don't know what that site wants there to be on my computer in order to be able to play the file. I probably don't want it anywhere near my machine anyway, so it doesn't really matter. The BIG THING about computer audio is the visual. One can take a recording and LOOK at it in a variety of ways, and analyze various aspects. This often makes it easy to identify what one hears. Therefore, only being able to listen to a problem recording is very limiting. Someone might come up with an answer; someone might just happen to be familiar enough with that type of problem to be certain what it is without further analysis, but the odds are worse.

Problem sounds like it could be either the tape or the shell. If the shell has warped try placing the tape in a new cassette shell. If the tape has stretched or otherwise become deformed you're SOL (Surely Out of Luck)

Since you say that it's repeating in regular intervals, I also think that woody is right. The effect on the sound that you've described ('something like it would be losing highs') can be associated with the mistracking. It is also possible that the cassette was near a small permanent magnet with directed field for some time. This can't be successfully repaired in an audio editor. You can also try another tape deck and see if the tape transport in your current deck is to blame. Maybe the roller is worn out, so the tape 'wobble'. But it's very likely that the problem is in the cassette.

A deteriorated or missing pressure pad is also a possibility.