I have a HO 4 6 0 DCC steam loco and I would like to know if I can incearse the volume
Welcome.
Yes you can. Check the CV list for the decoder you are using.
If a Bachmann loco, check this link.
You should give more info in your post as you have the loco and decoder.
https://www.bachmanntrains.com/home-usa/dcc.php
Rich
How are you making out, did you get it figured out?