Engineers sent letters to inform previously, the situation cannot be fully inserted by LINE_OUT1 (Appendix), so this will cause the sound to output, or there can be only one audio channel output
Engineers have been previously issued notification letters, then the situation is not fully inserted LINE_OUT1 (Annex), so this will cause the sound can not be output, or only have one channel can output
Formerly the engineer had round of letter notice, then condition was (e.g. appendix that) LINE_OUT1 is unable to insert completely, therefore this will cause the sound unable to output, or can only have a sound track can output