Please refrain from negotiating prices. I am not considering any further price reductions. I have confirmed that sound is output from all ports by connecting the cable and speakers. The No. 4 switch is slightly loose due to wear, so if a strong impact is applied to the main unit, the switch will automatically turn off. Switches 1, 2, and 3 are fine. The No. 4 switch can be used normally unless a strong impact is applied. There are traces of something having been stuck on the back of the main unit. (Images 2-5) Please understand the above before purchasing. 25101371