Kunio-kun no Nekketsu Soccer League [Model TJC-NV]

Pause anywhere
Using a 4-player adapter, push Select on controller 3 to pause the game anywhere (not just during a match) without stopping the music.

Sound test
On the Cloak Room screen (before the match), choose the option at right (Select BGM), and then put cursor to the 6th option, hold Left and press Select.