Tags : AVAudioEngine
AVAudioEngine has a equalizer function. That has some of filter types. Here is a just sample code of the parametric equalizer.
MP3 file format is popular but iOS can’t support for recording with MP3 file format. Here is a sample code using the lame which can convert pcm to mp3.
For instance, like Karaoke. In case of synchronized recording and playing audio. It is possible to realized by using AVAudioEngine. All source code is here. By using mixer node, you can add more inputs. Customize it yourself. Enjoy. Check it out.