I want to auralize the combined effect of different audio signals (e.g. an organ, a singer, and ambient noise) with their corresponding room response properties.

EASE 3.0 Only: There is no real-time auralization of multi-channel audio signals. You need to produce WAV files by the EARS convolver, combining the signals with their specific filters. Then, these WAV files can be combined properly in level and delay by using 'Ears/Mix WAV Files'.