First, there is existing materials about AUPreset, how to generate it and how to use it within xcode, which I don't bother to introduce here. Please see http://www.electricpeelsoftware.com/2013/02/22/creating-aupreset-files.html
and the related links provided there.
What I want to mention here is the outcome of my nearly 3 hours of debugging. I tried to use some files with name "F#2.caf", "G#2.caf" as my instrument sound. I put them into the "Sounds" folder, make an .aupreset file and point the file references to the right place with exactly those file names "F#2" "G#2". But it turns out that when I download this into my device, the instrument just won't work! Then I change the name to be "FF2.caf", "GG2.caf", it works. (Took me a long time to realize I should make this change)
Then I double check the working .aupreset file Trombone.aupreset, and found that although it uses some files called "1a#.caf", "2a#.caf", it references those as "1a%23.caf", "2a%23.caf". Oh! That's the problem. (It really took me a long time to discover the problem.)
I'm not sure whether there are any other file name constraints when doing aupreset. I can only suggest that following the convention of "Trombone.aupreset" is the best practice.
If you are reading this, you might be facing a similar problem. Try it!
(Plus: recently I also found that the "space" character" is not allowed in aupreset's file reference part.)
tangkk
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Google Translate:
谷歌翻译：
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首先，是关于AUPreset，如何产生的，以及如何使用它在Xcode，我不打扰这里介绍的现有材料。请参阅http://www.electricpeelsoftware.com/2013/02/22/creating-aupreset-files.html“
提供相关链接。
在这里我要提的是我近3个小时的调试结果。我试图用一些文件名称“F＃2.caf”，“G＃2.caf的”我的乐器声音。我把它们放到“声音”文件夹，使。aupreset文件和文件指向到正确的地方，正是这些文件名“F＃2”，“G＃2”。但事实证明，当我下载到我的设备，仪器就无法正常工作！然后，我将名称更改为“FF2.caf”，“GG2.caf”，它的工作原理。 （我花了很长时间才意识到，我应该做这种改变）
然后，我双检查工作。aupreset的文件Trombone.aupreset的，并发现，虽然它使用的一些文件名为“1A＃CAF”，“2A＃咖啡馆”，它引用作为“1A％23.caf的”，“2A ％23.caf“。哦！这就是问题。 （这真的花了我很长一段时间来发现问题。）
我不知道是否有任何其他的文件名的限制，做aupreset时。我只能建议，的惯例“Trombone.aupreset”后是最好的做法。
如果你正在读这篇文章，你可能会面临类似的问题。试试吧！
（加：最近我还发现，“空格”字符“不允许在aupreset文件引用部分）。
tangkk
