Scrub through stop animation timeline (using solo group) when mouse hovers on X-axis of a rectangle strip.

Hello everybody. What I am trying to achieve is a little complicated... so I have made a video instead which covers what I am trying to achieve and the problems I am running into. The summary is:

1. I have created a solo group made up of 24 circles in different positions which start at the center of the artboard and end on the left side.

2. I created two timelines... the first is a stop animation 24 frame timeline made from the solo group. The first frame of the timeline corresponds to the first circle (ball). The second timeline is the same concept bit in reverse.

3. My goal to to be able to hover my mouse over a horizontal rectangle strip from left to right, and cause the stop frame timeline 1 to scrub through it... frame by frame... and thereby making the ball appear to move to the left of the artboard. When I hover my mouse back the opposite direction... then the ball would move along back to the right.

Please see the video for a more in depth explanation.... and also some of the problems (potential bugs???) I have run into.

Thanks for any help