An audio management system was required to meet the needs of the A400M in terms of the diversity of radio systems used (V/UHF #1, V/UHF #2, V/UHF #3, V/UHF #4, HF #1, HF #2, MIDS #A, MIDS #B, SAT #1, SAT #2); radio navigation systems (DF, TACAN, ADF, MKR, VOR); intercom; Clear Audio/Secure Audio (COMSEC); aural announcements (EW: RWR). All this, to operate in electromagnetically hostile environments with high levels of safety, reliability and robustness, and also with civil and military aeronautical certification.