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5.1 Dts HD- Master/Dolby TrueHD? Onkyo TX-SR507? - 5.1 receivers onkyo tx-sr304s 5.1 channel receiver

I am interested in buying a new receiver for my home theater. I am really in TX-sr507. It has built-in Dolby TrueHD and DtsMaster. My research is that this receiver is only 5.1. If I do see a Blu-ray with DTS Master Audio track, which was mixed 7.1. You always get the DTS or Dolby True Master fully on the receiver? I understand that it would be prudent, but still ge tthat uncompressed signal via the HDMI settings in 5.1? Thanks in advance