Harmonic Sage query

[Grenage]

I was told that this feat allowed you to boost your performance by 1 - so inspire courage might give +2 or 3 at level 5.

Reading the text, it says that it boosts the DC by 1. That isn't the same thing, is it? I would have assumed the DC applied to monsters for offensive songs.

[Lathiira]

If it boosts a DC, then that affects a saving throw (Fort, Ref, or Will). That isn't the same as boosting the effect of inspire courage, which doesn't have a DC but instead increases specific die rolls by the specified amount.

[Grenage]

That's great, thank you!