Thanks Andreurivero.

Yes, I bought this expansion Ram. But I believed that the limit of 4 loaded files was a limit due to the OS of Audya, not due to a RAM size available.

One thing is established : Some commercial Styles ( Ajam or Camaro24 for example) know how to load a msp file on Chord2 and Chord3 tracks. I realize that creating a MSP file is impossible for a normal user without additional specific Equipments, but we already have existing MSP files at our disposal. But we ignore how to attach this kind of file on a Chord2 or Chord3 style track. It's very frustrating...