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Why not just use the up/down arrow keys?
Cause you can´t on a mac.
Another quick way to cycle through blend modes is to first click on the blend mode. Once one is selected, you can cycle through the rest by using your up and down arrows on your keyboard.
Oh, cool! Very handy, all of the tips on how to do this!
You can use the wheel on your mouse too. This will work on any dropdown box in Photoshop. Especially useful for cycling through text fonts.