According to Sustainability of Digital Formats: Planning for Library of Congress Collections
the technical note RP-029, "Bundling SMF and DLS data in an 'RMID' File" was published by the MIDI Manufacturers Association (MMA) in 2000.
It was available at http://www.midi.org
long time ago, but not anymore. Indeed, the document "rp29spec(rmid).pdf" can be read in the "Wayback Machine" at http://web.archive.org
following the link provided by the Library Of Congress.
I can understand that the format is deprecated, and should not be used anymore to produce new content in favor of other alternatives like XMF. Anyway, the access to the official specification is interesting for digital preservation
, so existing files in RMID format can be decoded and played in the future on new machines and Operating Systems. Maybe it can be published here again, perhaps with a prominent "deprecated" marking on it?
Second question. I am developing read-only support for RMID in my open source Drumstick libraries, and I want to test it. There are many examples of RMID files on the Internet. A few were included in several Windows editions. But I have never found a single example bundling SMF and DLS together. All of the examples I've accessed have SMF alone. Please, can someone provide one? Maybe Geoff?