Indeed, insert can be used to get signals. However, your demand is suggested to be realized through AUX. I don't know what kind of blender you use. If you have AUX, it is suggested that one AUX (such as AUX 1) of the newcomer's microphone should be adjusted to a suitable position, and all the AUX 1 of other channels should be adjusted to the lowest. Then turn the main control of AUX 1 to the appropriate position, and connect the output port of AUX 1 to the tape recorder, and you can record.

Why not suggest using insert to get the signal? One reason is that the plug-in usually takes the signal in front of the fader and equalizer, so the signal you take out has not been processed, the volume can't be controlled, and it may not be recorded well. Secondly, if there are multiple microphones (this pair must be a pair), two sounds must be taken out with two wires. Then how can you mix them together? So it still depends on grouping or auxiliary bus.