Auto-Reverse with Proto 1 Sounds on?

[wallyworld]

I have a set of CN&W MTH doodlebugs with Proto 1 sound. One is the powered version, the other is the non powered version. I have them coupled back to back. Is there a product or method to cycle the announcements of both arrival and departure sounds on a tangent track that automatically reverses at each bumper post at the end of the line? I know it’s feasible with products out on the market to do this reversing with the sounds turned off but it would be pretty cool as a display to do this with sounds. Any ideas?