That system dates from the 70's I beleive. Your best bet is e-bay, seen those things there. Those had some great sound depending on the model and the installation of all the stuff that made the system work. DCC has in the past few years become very simple and the sounds are getting much better now that sound is starting to become standard because it is getting cheaper to make a decoder do everything and then turn off the things you don't want. Recently I bought a few Baschmann sound value B units for a project and they were very cheap, played with the decoder and even though it came programed with only the prime mover, the other sounds were there.
I have 3 PFM sound systems with the SDS walk around throttle. All 3 of them are programmed to the same channel and one is missing the hand held control unit. How can I change the channel on the units so I can run multiple units at the same time. Is there any way I can get a hand held controller for the one that is missing one, or adapt something else