Switching Audio between Logic and Stereo

[brucecampbell]

I'm looking for ideas on a good method to switch my receiver's audio mode when the input is the same source.

I use Roku for Netflix and other video apps.
I'm now looking to use Roku for Spotify so the playlist is displaying on the TV.
Therefore the source will be the same for Netflix and Spotify, but I want Spotify to play music in 5ch Stereo, while Netflix should remain using Logic/DTS.

My receiver is Harmon Kardon AVR255

Audio source is optical out from the TV (Roku into TV via HDMI)
Therefore the receiver uses the same audio source for all Roku apps and all TV apps.

Any suggestions would be appreciated.

Thanks.