I have an RX-V1500. Quite some time ago (when I was still
using my Pronto TSU2000) I downloaded an Excel spreadsheet
that listed discrete codes for an RX-V2400. I found they
worked with the 1500. The HTR series are usually just
rebadged versions of the RX-V series, so it might work
for you as well.
When I set up my H880 I found that some of the codes in
the database for the 1500 didn't do what they were supposed
to, and many were missing (particularly access to some
of the DSP modes that were submodes, e.g. Movie: Adventure,
Movie: Sci-Fi).
I thought I found the spreadsheet here in the files area,
but it was a while back.
If you want to give it a shot I can email it to you. Send
an email to craig(dot)wagner(at)gmail(dot)com and I'll
send it to you when I get home from work.
EDIT:
I found it.
[Link: tinyurl.com]I tried the link to no avail. At least one person understands what Im talking about.