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Wiring a wav playing setup and shift register to the same arduino? Answered

I just ran into an issue with my current setup for a project I've been working on. I would like to hookup a wav playing setup (either the Adafruit Wave Shield or a wav playing setup like this) Issue I'm having is I can't change the pins around for the shift register setup (which I have setup and working just like I like!). 

I know this is probably a stupid question (what with stacking shields for the uno) but could I wire up multiple items to the same pin? IE wire pin 12 to both a shift register and a wav playing setup? If not, is there some way around this that would work on a micro that would not mean having to jump to a mega.

Thanks!

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