I finally had the time to set up a Raspberry Pi again, running TB4KServer, and connect it with an FCB1010 + TinyBox4Kemper + Profiler. I can't see any issue here... The Profiler System menu says "Connected : TinyBox v.1.0", and it stays this way during testing - no interrupts or disconnects. In the mean time I keep moving the FCB1010 volume pedal and I monitor the pedal movement on the Profiler system page which shows the pedal movement on a slider (and on the LED ring of the "volume pedal" knob). The Profiler indeed shows the tuner as soon as volume goes to 0, tuner goes away when moving the pedal up again. The TB4KServer window doesn't show any activity, it just has the MIDI IN and MIDI OUT of the TinyBox open.