how can multiplex multiple channels into one?

I can realize that just using module-loopback. like below

pactl load-module module-null-sink sink_name=playback1 channels=2 channel_map=front-left,front-right sink_properties=device.description=playback1
pactl load-module module-null-sink sink_name=playback2 channels=2 channel_map=rear-left,rear-right sink_properties=device.description=playback2

pactl load-module module-loopback latency_msec=30 channels=2 channel_map=front-left,front-right source=playback1.monitor remix=no sink=FOUR_CH_SINK
pactl load-module module-loopback latency_msec=30 channels=2 channel_map=rear-left,rear-right source=playback2.monitor remix=no sink=FOUR_CH_SINK

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