I hopefully can help with sound issues. I have a SoundBlaster Audigy Rx. Please checkout my tutorial thread in its entirety here:
and this post:
You will need to install all ALSA packages, including apulse, but not OSS or JACK packages and the three QAS Packages. Additionally make sure you have Audacious installed - refer to that second link I gave you. I still can only get sound from front centre speaker/s in respect of streaming, but for gaming and music, all speakers get sound once you make the adjustments in Audacious.
You might like to take a look at the Unofficial Manual I wrote for Zorin 17 Core from here:
Lastly if you have nVidia graphics card you might want to switch from Wayland (Zorin desktop) to 'Zorin on xorg'. To do this at the login screen, select your username, but don't enter the password, a small cog appears lower right of the screen. Click on the cog and when it opens, click on Zorin on xorg.