This Module is currently available.
RK003 Passive Mixer
Passive 8x stereo mini-jack mixer to 1x stereo mini-jack out or vice-versa (split 1 stereo channel to 8 out) Each port has a 100K resistor to it to protect audio signals from each other. Synch signals should not be bothered too much with this small resistor value.
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These merchants probably sell this module. Huh?