the cutting room mirror

Konjiki no Gash Bell!! Unare! Yuujou no Zakeru 2

The Japan-only sequel (though a US release was planned) to Zatch Bell! Electric Arena.

Sound Test#

At the title screen, press Up, Left, Right, Down, L, Up, Left, Up, Down, R, Left, Up, Right, Down, L. A code entry screen will appear. Enter 81216 as a code to add a sound test to the options menu.

(Source: GameFAQs (Luke40))