Bard mana regen songs

[Tenloar]

Hello fellow bards!

I have a questions in regards to bard mana song stacking.

Does the new level 20 mana song stack with the level 32 mana song? They both are classified as instant but the level 20 mana song is actually in ticks. So I'm assuming they stack but cannot verify.

And as far as the level 34 Cantana of Soothing,
Does that one stack with either the level 20 or 32 mana song?

I'm just curious as how they would all work.

Thanks for your time!