Solo over your own backing track on Positive Grid Spark! amp hack! trick!

When I got my positive grid SPARK amp I was disappointed it did not allow me to solo over MY OWN backing tracks. I came up with this little work around, try it out! so easy! I am sure you could use a LOOPER app instead of the camera app, but I wanted to keep the trick super simple. The usb adapter I got off amazon. just search usb to lightning adaptor. (mine is not APPLE brand)