Two new resources for the Matins responsories are now available.
First, the Nocturnale Romanum Project is working to provide a revised and more generally available version of the Nocturnale Romanum.
As a first step, they are publishing all the non-copyright chants from the Standhofe edition of the Nocturnale both online and in PDF form, and you can find the chants posted so far here. These are of course aligned to the Roman Office, not the Benedictine, so you will still need to use the listings provided here (or do the task yourself) to work out which ones fit where in the Benedictine Office (and of course there will be gaps).
The second big step forward is the publication of the Latin texts (as well as a Latin-French version) for Matins in the Benedictine Office as a joint project between Le Barroux and Le Garde monasteries, thus solving the problem of the scarcity of 1962 Monastic Breviaries.
It is worth knowing that the Gower nuns have also produced a set of Matins books, in a Latin-English version, but the work is not yet publicly available.
Hopefully the next step will be to publish the chants...