By virtue of knowing a bit about these kinds of things, I quite frequently get asked about what is perceived to be a very annoying bug on a DSTV decoder: some channels have the volume set really loud when they are changed to, although the rest of the channels are much softer.
This is not actually a bug, but a feature called “User Volume Setting”, albeit a somewhat confusing one in that as far as I can tell its existence or operation hasn’t been explained much.
It works by storing the volume for one or more channels, and then restoring it when that channel is visited.
What makes it seem like a bug is how it is activated: pressing OK on the remote control while the volume bar is still displayed will store the volume for that channel, with no indication to the user that this has been done. When the channel is visited in the future, the stored volume will be used.
The saved volume for any particular channel can be removed on your DSTV decoder like so:
Press Menu on the remote control
Go to Advanced Options
Go to TV Installation
Enter the PIN code of 9949 (this number does not change and can be found in your manual)
Go to User Volume Setting
Select the bouquet you want to alter (probably the main DSTV bouquet) by scrolling to it with the up or down arrow key and pressing OK on the remote control
Scroll the arrow key up or down until you highlight the channel you wish to remove the volume setting from, then press the left or right arrow to clear the saved volume (as explained in the help text at the bottom of the screen)
http://rooijan.za.net/how-to/how-to-fix-the-loud-channel-problem-on-your-dstv-decoder
