amplification doesn't seem to be increasing bard singing skill

[tibbs]

When using a combination of psalm of vitality and amplification at lvl 35 on a bard with 130 singing skill, psalm of vitality is giving no additional damage shield damage when amplification is running. (it gives 8 dmg regardless of if amplification is running). It also is giving no more resist component either.

Additionally, I was wearing a lute when I first tested it, but even without wearing a lute, amplification doesn't add any additional damage.

From what I remember, amplification should modify the singing skill and what it adds to a singing based song for every component besides haste, just like any other skill mod for bards.