Hi I just got a Line 6 Pod HD500 I have it connected
To my line 6 UX8 through the unbalanced
1/4 left out of HD500 into my instrument
1Input on the UX8 into sonar x2 but in sonar
I cannot adjust my guitar level in my track
The sound from my guitar is always constant
Even if I lower my level all the way in sonar
Could somone help?     
Thank you....

For input: Levels need to be adjusted from the hardware device itself. Use the physical preamp to adjust the level.

I do adjust the impute levels on my
Hardware but how could i adjust my 
Levels going to my monitors with my
Track in sonar why'll I'm playing?

You plug your HD 500 into the UX8 which is plugged into your computer. There is a volume on your UX8 and on your HD 500. Adjust those to get a good signal to record with. I assume your monitors are hooked up to the UX8. Do you have Pod farm open while your recording. Can you adjust it in there? Are you just using a tone from the HD 500?

Why not plug the HD500 directly in and record directly from the HD 500. Why go through the UX8 for guitar parts? Why not open up Pod farm to get a tone for recording and reamp later? Keep in mind you will always hear your guitar through your system. It will be constant because it is a live feed. If it is to loud turn down the volume on the HD500. 

Thank you....