I noticed the TokenDB entries for Lute of Free Fure and Widseth's Legendary Lute define what "may take other actions" means:
The bard may perform other Standard Actions (physically attack, cast spells, perform a Lore check, read scrolls, activate wands, drink potions, etc.) while performing bardsong.
tokendb.com/token/lute-of-free-fury/
tokendb.com/token/widseths-legendary-lute/
First off, I assume this means they can take up to 1 additional standard action, of any type that is a standard action, per round.
But! This seems to imply a Bard with these instruments has the following action possibilities while performing Bardsong:
1. Bardsong
2. Bardsong, Free action
3. Bardsong, Additional standard action
4. Bardsong, Additional standard action, free action
In particular, the following: Bardsong, Additional free action, free action is not permitted?
For example, a Bard couldn't use two of: Shield of the Scholar's scroll ability, Stu's +3 Handy Stein's Drink ability, Pouch of Tulz's ability, or Ring of Spell Storing ability in a single round.
Is that right?
Or can Bards downgrade their bonus standard action into a free action?