I decided to make this after listening to some Neo Geo music on Nebula Jukebox and accidentally finding a hidden track in the sound test of the third game with many instruments playing each note from the lowest to the highest pitch, so it was just a matter of isolating every interval and importing them to the Vienna soundfont editor. An easy, yet very long and tedious task.
There are 10 patches, but none of them have loop points (except for the saxophone, which was added as a raw pack) due to most instruments not behaving well with loops. I would like to expand the variety of patches at a later date, because I couldn't include stuff such as
(they aren't as exposed for potential sampling as the rest). As for the FM synths, you'd rather use something like VOPM or FM7/8. Download: http://dl.dropbox.com/u/1409948/Metal%20Slug.rar
Example: http://tindeck.com/listen/xvmk