This adds a small jack connector directly to the link port, so you don't need a link cable.
For syncing POs etc:
And Game Boys:
Not suitable for data, only clock. Fits all GB models except for GBA SP (blocks the power/audio connector).
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Looks awesome!
Any chance of an update to iOS/android Nanoloop to support this type of sync as a slave?
An extra adaptor [1] would be needed to separate the aux-in. But it would unify all the nanoloops somewhat.