Well, I checked using a small difference and it didn't work. I also tried to add an additional 8 copies varying delay values. That didn't work regarding increasing the vol more than 2 db.

So, this is what I've done.
1. Created a button on the remote labeled Vol + (for +1 db) and added the following hex:
0000 006D 0022 0006 0155 00AA 0015 0015 0015 0040 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0015 0015 0040 0015 0015 0015 0040 0015 0040 0015 0015 0015 0015 0015 0015 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0040 0015 0040 0015 0040 0015 05ED 0155 0055 0015 0E47 0155 0055 0015 0E47 0155 0055 0015 0E47

2. Created a button on the remote labeled Vol++ (for +2 db) and added the following hex:
0000 006D 0032 0002 0155 00AA 0015 0015 0015 0040 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0015 0015 0040 0015 0015 0015 0040 0015 0040 0015 0015 0015 0015 0015 0015 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0040 0015 0040 0015 0040 0015 05ED 0155 0055 0015 0C00 0155 0055 0015 0E00 0155 0055 0015 0C00 0155 0055 0015 1000 0155 0055 0015 0C00 0155 0055 0015 1000 0155 0055 0015 0E00 0155 0055 0015 0C00 0155 0055 0015 0E00

3. Created a button on the remote labeled Vol- (for -1 db) and added the following hex:
0000 006D 0022 0006 0155 00AA 0015 0015 0015 0040 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0015 0015 0015 0015 0040 0015 0040 0015 0040 0015 05ED 0155 0055 0015 0E47 0155 0055 0015 0E47 0155 0055 0015 0E47

4. Created a button on the remote labeled Vol-- (for -2 db) and added the following hex:
0000 006D 0032 0002 0155 00AA 0015 0015 0015 0040 0015 0015 0015 0040 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0015 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0040 0015 0040 0015 0015 0015 0040 0015 0040 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0015 0040 0015 0015 0015 0015 0015 0040 0015 0040 0015 0040 0015 05ED 0155 0055 0015 0C00 0155 0055 0015 0E00 0155 0055 0015 0C00 0155 0055 0015 1000 0155 0055 0015 0C00 0155 0055 0015 1000 0155 0055 0015 0E00 0155 0055 0015 0C00 0155 0055 0015 0E00

Then in the macro for VolUP:
Vol++
Vol++
Vol+

Which will increase volume by 5 db.

Then in the macro VolDN
Vol--
Vol-

Which will decrease volume by 3 db.

By clicking VolUP and VolDN in a specific sequence one can get the db to change 2 db.

Lets say volume is -25db. VolUp increases it to -20, VolDN will decrease it to -23. Another VolUP will get you -18 and VolDN will get you -21. A plus or minus 2 -3 db change seems to work well in my theater.

I appreciate all of your help. I do have 1 further question if you have time. Is there a way to concatenate the 2 X Vol++ and 1 X Vol+ into a single code so it would send faster? Or would it actually send faster?