I'm not sure anyone notice this, but Busan Subway announcement within the train and on the platform are actually available for download from the 부산교통공사 website. Announcement of next approaching station and approaching train are available, as well as some of the previous versions of announcement are available for download. One particular cool thing that I found available in Busan subway is the available of four languages announcement :
한국어 : 지금 장산, 장산행 열차가 들어오고 있습니다. 고객 여러분께서는 한 걸음 물러서 주시기 바랍니다.
English : The train for Jangsan, Jangsan is now arriving.
日本語 : 萇山, 萇山行きの電車が参ります。
中文 : 开往장산, 장산方向的列车马上就要进站了。
Do check out more of these announcements MP3 or WAV file download and also the statistics for passenger ridership of each line and stations are available.