What kind of source audio is required? ie. what kind of mixers/output is required
Our main MacBook software is called SoundCaster. It operates much like any other Digital Audio Workstation (DAW) in that it can recognize any audio source that can connect to the Macbook. Many of the newer digital mixers have USB out. Some older mixer have firewire, etc. If you have an analog board you can use an Audio Interface to get the audio into the MAC via USB. SoundCaster can even recognize audio from Dante using their virtual sound card.
Once you get the raw audio into the Mac, SoundCaster packages up all the raw audio and broadcasts it over Wi-Fi to the Performer app running on each musician's iPhone where they both hear and customize their mix.