Hello Tizianos,
I have tried it as well and can confirm that there is a problem. You may have found a bug which I will need to look into a bit more. As soon as I know more about the second channel getting stuck I will let you know. I hope to have a solution near the end of next week.
Next to this bug I would like to ask you to set your dimmers in an 8 bit mode. Because setting two channels to the same value does not make a fade more smooth. Yes you will use 16 bit but you will not get a 16 bit effect this way.
The string used in the task "core-dmx-1=" is a string which is implemented in the API of the CueCore2. The CueCore2 will response to specific messages. The API does not have a message to control multiple channels. Because you should be able to send multiple messages. However because of a bug in the IoCore this does not work. A list of the commands supported by the CueCore2 can be found in the manual of the CueCore2. Except for the "core-dmx-1=<interger>" and "core-hello" because these commands where added after the manual was created. (We will update the manual.)
About the playback and track programming. The CueCore2 only has 6 playbacks. And a maximum of 128 tracks. If you want to control 52 lights individual using switches. I think you will not have enough tracks and playbacks, to control everything individually.
Best regards,
Guido