Can you connect a reverb along with a surround sound?

You cannot add an external reverb to a surround sound (Dolby Digital or DTS) signal connected through the digital input, such as a DVD player. Many receivers can add reverb and ambient echo to the sound themselves to emulate different venues. If you want reverb for your voice for Karaoke, you can do this inside the DVD player or by adding an external reverb processor that adds effects to the microphone cable signal.