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lossy formats

In information technology, lossy compression is a data compression method which discards (loses) some of the data, in order to achieve its goal, with the result that decompressing the data yields content that is different from the original, though similar enough to be useful in some way.

Help requested: 4-channel WAV format

I recorded a concert with 4 mics to a EDIROL R-44. While I meant to record the session as 4xmono, I inadvertently selected 4-channel WAV as the record mode. I am now stuck with this file format which is not very common. What software can import this WAV file format. Is it still possible to decompose this single wav file into the four original channels so I can produce a stereo wav file.

Digital audio files: formats, structures, time stamps, etc.

I have to confess that my knowledge of digital audio formats and the structure of various files is, at best, spotty. I'm going to have to swap files with people adding tracks to some base tracks I am recording, and I'd like to, uhh, actually know what I am doing. Can someone direct me to a reliable book, website, etc. where I can learn the details.