I'm sorry to hear this. We collaborated (via the internet) on the conversion of the DT to abc. He was enthusiastic in contacting the developers of abc software to verify what features outside of the old standard would be widely supported (and to suggest some that might be). When I last exchanged emails with him (some time ago now) he was working his way through the files, tidying up my automatic conversion and preparing a good copy, and was hoping to devote more time to it.

Condolences to his family.

Mick