You not alone with this question, its come up several times.
It was in the adendum for the beta or final release of OS 2.7 but the actual feature was not made available. Marc from access has mentioned in previous posts that they are working on it.
So ye, I hope to see this available soon and working well because its highly anticipated for me and I think it should have been made available from the start with the USB feature as I dont make use of the analog i/o
