I tested tightvncserver and got it running with xfce4 then tried remmina. I got an 8-bit display even though i had specified 24-bit. Then I ran
xwininfo -root and it said X was 24-bit. So I tried xtightvncviewer. The display was nice and smooth 24-bit. So I started to have some fun and fired up the Opera web browser. It showed me a YouTube link so I just clicked on it. Immediately, there was a video that looked interesting, so I just clicked there so I could try full screen and other hotkeys the player supports. All the keys I regularly used work OK then I realized there was sound! So I think it is a matter of xtightvncviewer vs remmina. Give xtightvncviewer a try. I have no idea how it accomplished sound, but it did it.
FYI, I did all this on Ubuntu 16.04.2 LTS with tightvncserver 1.3.10-0ubuntu3, xtightvncviewer 1.3.10-0ubuntu3, and remmina 1.1.2-3ubuntu1.