Connecting a headphone or line signal directly to your cab will not make any noise.
If your amp has a line in, connect the line out (the RCAs) to the amp's line in. This would require either a single RCA to 1/4" TS cable, or two, if your amp has stereo line in.
If no line in, you may able to get away with running the line in of the Kaossilator to the instrument input, although you may have issues with clipping.
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