Every world needs a full range of sounds both in the background and for vehicles and gadgets. Most sounds can be created by just recording it and then do a clean up on the file. Others requires you to create the sound from scratch by mixing midi and wave sounds. A sound can take as much time to make as total 3D build and its often really important for the ambiance of the scene.
Virtual world artist and blogger. Developer of software and stuff. Read more at My blog
When i am inworld i use my Oculus rift so if i do not answer the chat it is because i cant see my keyboard. Try voice.