I have the N810 running the latest version of OS2008

I have carefully read every post and every link and done additional searching. I believe I have everything setup correctly. I have the 'host' and 'OTG' apps in my extras. I select 'host' and then plug in my Nokia cable (microUSB to standard USB), the Fem/Fem adapter and then a range of USB devices. Nothing works. When I plug in I get the initial message:
"USB device not supported"
Then I get another box saying:
"Unable to connect, no file system available"
A USB sysmol appears in the Statusbar. Selecting this shows the following:
Connected to mass storage device (greyed out)
Disable mass storage device (avaialble to select)

Devices I have tried:
2 different USB SD 'jump' drives with 2gb SD and 4gb SCHC cards
An xD USB 'jump' drive
Canon S3-IS camera
A stand alone multi card reader with 4gb MiniSD SDHC card
The last reader is the only one whre the green LED goes on and stays on. The otheres either dont light at all (xD drive) or go on for a moment and then go out.

QUESTIONS:
What am I actually going to see if and when it does work?
Can I 'see' the extra card in the N810's file manager?
If so what should it be called?
Do I need to go to xTerm to see it?
Will it be visible to the media player?
What might I be doing wrong?

HELP! after hours and hours of reading and installation (hacking more like) I am so close but so far...

Derek.