Baking powder: More crunchy and less hard
Baking soda: Same as baking powder
Cream of tartar: More crunchy and less hard but bitter, like the bitter taste in yellow noddles (kee in hokkien) except worse.
Baking powder and cream of tartar: Er, I added cream of tartar to see if it would counteract the effect of baking powder but i don't remember my observations.
Well, I get to do it again next time. Hopefully, I'll remember to use my brand spanking new cinnamon powder.