Tech 6 Sound Controller 6.0 The only DC power pack that unleashes all of the sounds trapped in your sound equipped locos. Ready to bring your layout to life with sound equipped locos but have too many standard locos or not ready for DCC? Consider MRC"s Tech6 Train Control. Use this powerful unit to operate your layout whether you want to run a standard non decoder equipped loco or you want a sound equipped DCC type loco. This pack will operate both types with the mere flick of a switch..