The singing machine SML505 Pdf User Manuals. View online or download The singing machine SML505 Instruction Manual Related Manuals for The Singing Machine SML505. Karaoke System The Singing Machine SML-383 Instruction Manual. Portable cd + graphics with built- in. Doigital Voice Effect Singing Record your voice or music using the phone mic and then apply sound effects to your recordings. When you’re happy with them, save them for later playback….