The Broadcast Tools MSRP-3 AES is a three station AES/EBU digital EAS relay/switcher following in the footsteps of the original Multi-Station Relay Panel (MSRP) designed by Broadcast Tools for the Sage ENDEC in 1996, and the Broadcast Tools ADCS-III. The MSRP-3 AES provides additional alert audio distribution and transparent audio interrupt switching for EAS encoders.