G8B4Life: It is a LM-1. I have had it for a while now but never bothered with the sound. When the HC-2 found it, it loaded the volume control and the Horn, Bell, and other sound buttons, plus all the configuration settings for sound. The HC-2 shows none of this for any of my LM-2.
The speaker is the long thin one you have pictured. I tried a second one this morning with the same results; no sound. I also tried a more conventional round speaker and got nothing with that either.
But: if I select the Bell sound and put my ear real close to the speaker, I can barely hear the Bell along with static. This happens with any speaker I tried. This is with the volume all the way up.
My next step is to download new sound files.