Targus Universal Docking Station Audio
All of the Targus Universal Docking Stations have 2-channel (stereo) audio in/out jacks.
The ACP70 and ACP71 have an HDMI 1.4b port carrying 6-channel (5.1 aka surround sound) PCM audio including Dolby Digital, Dolby Pro Logic II, DTS, and SDDS and other common 5.1 systems, or 2-channel audio, as originated at the PC/Macbook source.
The ACP77 has two DisplayPort 1.2 ports with 2-channel (stereo) audio PCM audio.
The DVI-I ports on the ACP076, ACP70, and ACP71 are VGA compatible, but DVI does not carry audio.