Roland US has made many many manuals available online:
http://www.rolandus.com/support/product_manual.asp
Currently they seem to wish you to agree to certain terms,
and then they will email a link to the requested document(s).
Elsewhere
Francois Rossi
compiled this list of links to sites with manuals and/or
schematics and/or other documents available, some free,
some for a fee, some electronic, some paper.
Francois mentioned that he uses Mark Glinsky and Ranger Audio
most often.
The zzounds collection does not seem to be accessible there
any more, but it was noted that the (un-annotated) collection seems to
be available here:
http://media.musicalplanet.com/pdf/
John Sellens is teaching
"Databases: What You Need to Know",
"Performance Tracking with Cacti",
and
"Nagios: Advanced Topics"
at the
2008 USENIX LISA System Administration Conference
in San Diego, CA, November 9-14.
(The Preceding is Free Volunteer Advertising for Worthy Causes)