Have you used or do you know anything about using 'recordable sound chips' like those found in greeting cards and such? Part of my long term plan is to place 10 to 50 sound chips around the layout. These will be more for the entertainment of the visitors and in particular children. Examples of usage: Farm sounds Factory sounds Train whistles Conductors - "All Aboard", "Train Leaving in ..." Apartment building sounds such as screams Children playing Hobos around a fire Rail-fans taking pictures and talking I have seen them on 'Amazon' but have no idea how complicated it is to: Record the sound - Can I send one from the computer? or must I do it analog style? Cause them to play - momentary contact? Replace the battery - which most say is good for '300' playbacks. Are there any other considerations?