Temporarily modify speed (DnD 5th Edition Character sheet)

Would we be able to get a way to add modifiers to a character's speed? Either a global speed modifier, or a way to change speed using the mods in the items.  I'm playing a Bladesinger, and I want to be able to change my speed temporarily when I activate the bladesong.  Does anyone have any suggestions on how macro's could be used? 

Macros cannot make changes to a character sheet, for that you need a Mod (API Script). The script ChatSetAttr can change your speed. 

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