i'd only add , check the speaker impeadance/resistance, ive had Bachmann engines that had a 4 ohm speaker, i cant see any detail on the HM7000 , but ive measured the HM7000 cube resitance at 7.1Ω so i guess thats a nominal 8Ω speaker
ive only bought an 8pin with no stay alive to test for now with the default steam sounds, untill the DCC app is avaiable . Also i'm using an NCE controller to test with. but it physcially fits, and works in: Bachmann 31-211. Patriot Bachmann Branchline 32-400 class 25 Hornby R3223 class 43xx, very tight to get a speaker in as well in the coal hopper. ive