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Introduction SX or SOUNDEX is the first and official street team, fan group, and US promoter of the Japanese Pop-rock band BACK-ON. Fans from parts of the US and Europe have come together to make this site. SX is here to bring the fans closer to the bands supported by this site by keeping them updated with the latest news these bands have. This page gets updated regularly and its fan base is slowly growing larger. The SX Staff would like to thank everyone for visiting the site as well as supporting and joining us and the band.