Using a Rhythm with an imac using the internal speakers

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I bought a rhythm as soon as it came out.. but i don't use it much.. the reason is I need to crank up the volume to nightclub level in order to make it work.. this while the rhythm is just 2 meters away from my computer.
I would like to connect it using an audio cable.. but when I plug in an audio cable i lose the sound on my 2019 imac. Anyway ever figured a way around this? (without using external speakers) ?