Well, the search function can be very useful at times......

Mute Device Code: 0 Function: 11
0000 006E 0000 000C 001A 0110 001A 00B5 001A 00B5 001A 00B5 001A 00B5 001A 00B5 001A 00B5 001A 0110 001A 00B5 001A 0110 001A 0110 001A 081A

This thread  has Vol+, Vol-, and Mute as learned.  The learns aren't perfectly done, but we can see that Vol+ and Vol- match the ones you learned.  The Pronto Hex for Mute above is cleaned up from the incomplete learn in the thread. 

I don't know how to make the Volume signals repeat when you hold the button down.  One possibility is to shorten the last number from 081A to something shorter  perhaps 0600 or 0400.  It may also be that the method you're using to get these IR signals into a remote doesn't preserve the repeating capability.

By the way, I included links to MakeHex and the GUI program in a previous post.  You should be able to use those to make any combination of device 0 through 7, and function number 0 to 63.  That way you can try any valid IR signal.