Sound decoder Followup

At our annual train show last month I chanced upon the ESU LOKSOUND Select micro decoder. This is just what I needed, slightly smaller than the decoder that came installed and acceptable sound with the included oval speaker. which I put in the coal bunker and fabricated a new coal load to hide the speaker.

What exactly are we following up on? The other post is a GP9. Please keep the same thread instead of starting new posts.

Pete