I used the cl1 and everything worked as it should except no matter how many times I saved, when I turned off the program and back on it lost all programming. So the HC-2 is bad. And all I had hooked up was the speaker, with other wires individually electrical taped over and all sounds were working well for 15 minutes...BUT then the temp warning came on and the damn LM3S literally melted down the outer case before I could get it off the track. The speaker is 8 ohms so no problem there and I double checked all wiring and it was all in place and no grounding anywhere. I have run this same diesel loco several times with no issues before. I put the DC plug back in and ran the loco again with DC power with no issues, especially no overheating of any kind. This has been a nightmare!