This is about AUX from the Audio Synth

Back in December 2022 I bought a kit named MAKE YOUR UNO KIT and in the box ther are two boards. An Arduino UNO and the Audio Synth. I feel it has been a knockdown about the AUX connection. How do I connect the Audio Synth? The pin's from the Audio Synth arer connected to the Arduino UNO, is that right or wrong?

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