I have been tossing around the idea of making a sound pack for Tube Sim. I am currently using one I created with a mixture of sounds from the original game sounds, the only sound pack that is currently up on the website, and what I replaced was the door opening and closing sounds with actual sounds recorded from a real Tube Train, and where I deviated a bit was I ended up using motor sound from a NYC Subway train. The only thing I have not been able to figure out is how to get the transitions smooth again between underground and going above ground and visa versa.
Jordan
