Polaroid Spectra Multiple Exposures

I recently acquired a Polaroid Spectra System camera at the thrift store. Wow what a find and only $3.88. I found that with its timer feature you can take multiple exposure pics. What I do is open it up, set the timer and let it take its picture. Then it seems it won't spit out the pic until you flip the timer switch back. So I just close the camera without flipping the switch back up and then open it back up with the switch on. Now its taking another picture so you better be ready to take the picture when you open it back up. When you want it to spit out the pic, just flip the switch. I guess you can take as many exposures on on peice of film as you want. I've only done two on one.