For those who are searching for a cheap SD-card socket, maybe this is a solution:
I’ve tested an Delock USB SD-card reader at reichelt.de (DELOCK 91667, 3,45EUR) and dismantled it, to unveil the secrets. There are some test-pads on the small PCB, where you can solder easily your ribbon-cable and fix it with hot-glue. See test-pad signal description in the attachment (the common SD card slot is on the backside, here only the slot for microSD can be seen):
Of course you should not plug it into an USB slot, when connected to the MIDIbox core. You can for example desolder the USB connector at all…
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cheaper then raw SD-slot
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SD card can be changed
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normal SD card as well as miniSD, microSD can be used
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fiddly thing until all cables are connected
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not so easy to fix into complete MIDIbox assembly (e.g. can not be screwed to housing, since PCB to small)