I have a similar issue – my band wants me to have lots of samples so I just ended up including a Jamman Looper/Sampler into my rig. I’m currently in the process of passing the buck to my keyboardist since he rocks a Macbook for his synths. It’d be way easier for him to do it than for me to tap dance… 

The other logical option would be an iPad/Phone/pod with the sample/intro on it. 

Shouldn’t be too hard – the Timefactor has 2 inputs…