How to make a multi-Channel auto-play audio player

[minizzZ]

Hello,

For an art piece I need a stand-alone audio player which plays 5 separate mono tracks in a loop to 5 audio outputs. Because the art piece will be part of a travelling exhibition, where I won't be present most of the time It needs to be able to auto-play when being started and even in the way that If you disconnect the power and you start it up it should start playing automaticly.
Now I like the Octo. Which player for Raspberry Pi in combination with this sound card would work best in the way I described it here above?

Maybe you can explain me how or you know another way. I would like to hear your thoughts.

Kind regards,

Marinus