You can look at the MoMu release of the Synthesis Tool Kit (STK) library. It has a permissive license and is lightweight, however if depends what kind of "effects" you are looking for. It has all the building blocks to do sound synthesis and processing (class documentation here).
iOS 5 has some new built-in Audio Units for filters and some other simple effects. Before iOS 5, it appears that most audio app developers rolled their own DSP effect libraries (or purchased a commercial time-pitch library, etc)
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您可以查看综合工具套件 (STK) 库的 MoMu 版本。它有一个宽松的许可证并且是轻量级的，但是这取决于您正在寻找什么样的“效果”。它具有进行声音合成和处理的所有构建块（类文档此处） 。
You can look at the MoMu release of the Synthesis Tool Kit (STK) library. It has a permissive license and is lightweight, however if depends what kind of "effects" you are looking for. It has all the building blocks to do sound synthesis and processing (class documentation here).
我认为你应该使用这个适用于 iOS/OSX 的音频 DSP 库： NVDSP
它很容易使用，但仍然产生高质量的结果。
在你提出问题时它还不存在，但是我认为这是今天最好的选择。我真的不会仅仅因为我写了它就这么说！ ;)
I think you should use this audio DSP library for iOS/OSX: NVDSP
It is easy to use but still produces high-quality results.
It didn't exist at the time of your question, but well, I think it's the best option today. And I really don't say that just because I wrote it! ;)
iOS 5 有一些新的内置音频单元，用于过滤器和其他一些简单的效果。在 iOS 5 之前，大多数音频应用程序开发人员似乎都推出了自己的 DSP 效果库（或购买了商业时间音调库等）
iOS 5 has some new built-in Audio Units for filters and some other simple effects. Before iOS 5, it appears that most audio app developers rolled their own DSP effect libraries (or purchased a commercial time-pitch library, etc)
试试这个 http://theamazingaudioengine.com/
有点晚了，但可能会帮助别人
Try this http://theamazingaudioengine.com/
Little late but might help someone else
虽然也晚了，但很棒的音效库是由 LittleEndian.com 制作的
Also late, but great sound effect libraries are made by LittleEndian.com