For Xubuntu interface:
Yes there is a control setting, but there is no applet to set the sound on right or left speaker, neither there is a equalizer. I look for a graphical solution, not one on a terminal.
I check on the software centre, but find nothing for my interface. I even try some for other interfaces with no success. I check on internet and found no answer specific to that situation.
I was on Ubuntu 16.04 flashback (Gnome2 interface) user.
I am now on Xubuntu 18.04. I really need your help. I must say, I am quite surprise that seems to be so difficult to find.
Thank you in advance.