Interestingly, if you can get the use of a programmer, you can very easily load sounds onto a Select, Select Direct.
However changes were made to these V4.0 chips to only use ESU supplied projects. They are thus so locked. Friends much more knowledgeable than I suggest that ESU had to compete in the USA with Tsunami and Wow decoders at much reduced prices. It was cheaper to lock the V4.0 decoders than develop a new cheap chip. Compare the physical chips! they look exactly the same.
I have seen that Auscision 48 Class projects are advertised on the ESU (USA) sound page, and the project can be loaded to Select Direct, thus I presume Select OEM can also be programmed? I did not think to ask.
The best selling point for buying Loksound decoders, is that unlike Tsunami, you can get individual sounds. Tsunami tend to offer a single engine which you use in 6 cyl to 20 cyl engines. Loksound have more than 60 variations. Also you can load them on and change them yourself. I love the WoW's but I have sent several back to the States for repair or upgrades, as the promised programmer never eventuated. One rumor was that you could buy a project and load it on over the net same as music to your iphone?