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But unfortunately the commands only startup the BM in muted state and I can´t get it to unmute
But instead of the 0x09 at the end (digit-9) give it a try with 0x60 (volume up) or 0x0d (mute toggle). Maybe it will then leave the muted state it started up with.
Did a quick test run today. I wasn’t able to get it out of the initial muted state as well when started through DL’86 commands. By commands on the Audio Aux Link connector I mean.
As soon as you touch a key on the remote or on the device directly it will unmute.
Sending virtual volume keys works and you can see the volume on the device is changing. Nevertheless it stays muted. The 0x0d mute command is ignored and does nothing. Maybe there is some kind of hidden command somewhere to enable the output but I couldn’t find that yet.
So if you want to stay with the cabled version maybe just try shorting the DL80 and the DL86 pins together. Then you can send a DL80 “switch on” command (which doesn’t mute the unit by default) and then switch over to DL86 for having the convenience of a more advanced protocol. Looking like sending DL86 commands into one of the DL80 connectors does trigger nothing. So any additional unit connected there might just happily ignore it. At least worth a try.