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 Forum index » Instruments and Equipment » Samplers
Root note - Wav header hell
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torsig1967



Joined: Mar 29, 2006
Posts: 162
Location: Sweden
Audio files: 2
G2 patch files: 1

PostPosted: Sat Jul 24, 2010 12:24 pm    Post subject: Root note - Wav header hell
Subject description: Anyone who knows about this?
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While testing Loop Editor from Audiofile-Engineering I found inconsitencies in the way root note i swritten to the header of wave files.

Does anyone have any info on the standards here. To me it seems like a complete mess.

This is what I found but I don't really understand it. I used a bunch of samples I found on the net.

In their original format the root note (which was in the file from the start) was read correctly by all three samplers I tried:
- Akai MPC1000
- Waldorf Blofeld/Spectre
- Logic EXS24

Audio File Engineering's Loop Editor did not read this root note info. However I could write my own root note. After doing this, the following happened.
- Akai MPC1000 refuses to play the file or even load it.
- Waldorf Blofeld/Spectre ignores the new root note info. Reads the old data.
- Logic/EXS24 reads the new root note and ignoers the previous.

In addition the sample library converter CDXtract will read the new root note data but all audio is gone from the file instead! So from CDXtract point of view the file is corrupt.

So my confused conclusion is. There are at least two positions with root note info in the newly created file from Loop Editor. Akai doesn't like the new header (it does read files from Loop Editor as long as I only edit loop points) and Waldorf ignores it. The new header must be correct in some way otherwise EXS24 wouldn't read it.

Well this is a real mess. What are the standards for the headers?
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BobTheDog



Joined: Feb 28, 2005
Posts: 3879
Location: England
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PostPosted: Fri Jul 30, 2010 4:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

They are a mess.

Have a look at the sampler chunk and instrument chunk.

http://web.archive.org/web/19991115123323/http://www.borg.com/~jglatt/tech/wave.htm
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