Audiofusion Performer is a free iPhone app developed by Audio Fusion Systems LLC. It allows users to receive real-time audio over Wi-Fi and play it through their earphones, effectively turning their iPhone into a wireless in-ear monitoring system.

One of the standout features of Audiofusion Performer is its complete monitor mixer functionality. Users have full control over the sound in their ears, with the ability to adjust the volume, panning, and labeling of each audio input to create their personalized mix. This level of customization ensures that musicians can hear exactly what they need during performances or practice sessions.

To receive audio, Audiofusion Performer relies on the Audiofusion SoundCaster app, which runs on a MacBook. SoundCaster connects to the user's digital audio source and broadcasts it in real-time over Wi-Fi to each connected Performer. It's worth noting that Performer will only receive audio from Audio Fusion's SoundCaster software.

For sound technicians or monitor engineers, there is a third app called Audiofusion Director, designed for iPad. This app allows them to hear the mix that each musician has on their Audiofusion Performer. Director provides simultaneous control over each musician's mix, making troubleshooting and fine-tuning easier. Additionally, it allows for editing instrument labels and remote control of the audio settings on SoundCaster.

With Audiofusion Performer, musicians can enjoy the benefits of a wireless in-ear monitoring system on their iPhone, with complete control over their personalized mix. The integration with SoundCaster and Director further enhances the functionality and flexibility of this app.