Mixtour Pro not working with Android

I just received my new Mixtour Pro, which is advertized as Android compatible via Djay but I have several problems with it. I tried three different systems but they all have different failure modes:

  1. with a Samsung S24 Ultra:
    a) Audio works via Bluetooth, but pre-cue does not work (cannot even select channel)
    b) if I remove BT and connect via RCA connector, pre-cue works but the music is played at 4 times the speed and cannot be slowed down.

  2. with a Samsung Tab7+:
    a) Audio works via Bluetooth, but pre-cue does not work (volume for pre-cue moves but no sound)
    b) if I remove BT and connect via RCA connector, no sound at all

  3. with an iPhone14:
    Audio works ok, pre-cue works, but the phone does not charge (65W charger connected, the Android devices charge)

Is there a way to get the Android devices to work? They are my main devices.

Many thanks