After investigation, Sony has confirmed an issue with ILME-FX6 System Software Ver. 5.00, which was released on May 28, 2024 (JST). After updating to Ver. 5.00 ,if you turn ON the power with the INPUT2 (audio input 2) switch set to LINE, the audio from CH2 may become unintended level.
Due to this issue, we have suspended the download of ILME-FX6 System Software Ver. 5.00. We apologise for the inconvenience and will rectify the situation by releasing a corrected version as soon as possible.
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Thanks Michael for the tip!