Reply To: QU-Pad persistent connection

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According to the A&H Qu Mixer MIDI Protocol V1.5
Active Sensing
Qu supports MIDI Active Sensing over its TCP/IP Ethernet connection to detect connection status. Qu will send an initial Active Sense byte (FE) once an Ethernet connection is established, and then once every 300ms or so during any period of inactivity.

In other words, the mixer needs to see a message from the connected device every 1/3 of a second or it will disconnect.
When you switch apps, QuPad is inactive and cannot send anything to the mixer. So, in a word, no. There is nothing you can do.

You could buy another iPad if you have the dough. That might be the easiest solution.