Hey @manymanyhaha
Yes, its frustrating, the problem is Ableton that is not sending the corresponding midi message to the controller. I don’t know any workarounds with standard mapping.
You could use the YURS remote script just for the SOLO’s and keep everything else as it is.
Tip: This little guy has a “spy on output destination” feature which is perfect for this kind of debugging.
The idea is to “spy” the messages that Ableton is sending to the controller, if you try with the SOLO button you will notice that it does not send any message when you press it. But if you try with a MUTE it will send the corresponding message to the controller, etc.