Thx for your quick reply!
Yeah, that makes also sense to me.
To my mind just came, that visual feedback would be a little more easier to handle on a dark stage than feeling the sliding switch all the time (in my setup I change the mode often from OFF to ON and back).
Maybe it would make sense, that the LED is not blinking in OFF-mode ONLY when the minibrute recognizes an external MIDI-clock. In this case, knowing the actual tempo of the arp is less important to me, than knowing if the mode is ON or OFF!
But that's just a suggestion. I could also live with checking the sliding-switch