I doubt any exist at the moment. Everyone has to use the same cheap ones until someone makes a better one.
ALO is making adaptors, but any cable maker will be able to do it.
If you're on a Mac, you'll need to use The Missing Sync for Android.
For future reference:
It has the ability to sync a lot of types of data, but we only want the Music module.
Inside the Music module settings, you need to click on the "Advanced" button and AIF, AIFF, AAC, M4A, WAV and FLAC to the list of recognised files (and others if you use them).
If you want to copy DSD files (and they aren't in iTunes), the "File" module can copy them too.
If you install Android File Transfer to copy files, it will screw up The Missing Sync by auto-opening every time you connect the AK240. You need to remove it from your Login Items in the System Preferences (Users and Groups -> Your main user -> Login Items). Unfortunately, it keeps installing itself there whenever it is run, so you have to right-click on it in the Login Items and "Reveal in Finder" then trash it, then set the enclosing folder to be "Read Only" as it persistently re-installs itself.
Thank you Amos for your information