Song haste stacking

[guineapig]

Thanks for the clarification.
That's actually not bad, considering the AC, resist and DS songs that are often not twisted in groups due to always twisting the haste song.

One more question, which overwrites which?

Example:

Enchanter casts Quickness on the group, then bard sings Jonthan's Whistling Warsong.
Which haste is being used?
Is it always whatever the highest haste %?

Another example:

Jonthan's Whistling Warsong
versus
Augmentation

Which stats end up being used?