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Done!
I've put the control lines of the 2 chips together and pull them up to V+ using a 10k resistor.
For the moment, I haven't hooked anything up to 'the other side'.
I already found 1 error: I didn't connect the ENABLE pins to GND, which explains why I couldn't 'bleep' the two rows when the WAV trigger was connected. That issue is solved now, all the connections are made when I look with my multimeter. The board still cannot read the SD card, though. On the CLK pin I see a clean 24Mhz carrier, just as I would without the modification.