Problems Enabling Realtime Thread

Sorry if this has been brought up before, i did what i thought was sufficient digging around and couldnt find anything that answered my question.

Im having problems enabling the realtime threading for renoise linux on ubuntu 8.04.
Heres the kernel -

Linux thelab 2.6.24-19-rt #1 SMP PREEMPT RT Sat Jul 12 02:53:01 UTC 2008 i686 GNU/Linux

I read thru neurotix (spelling?) brilliant FAQ and tried to enable a super user id for renoise so it could be run as root while still logged in as a normal user, and its here i stumbled on a problem.

Even tho the system wide installation of renoise i did went without a hitch, and running renoise normally is totally problem free (ie without the rt preemption ninja action) i get this error

root@thelab:~# ls -l ‘which renoise’
ls: cannot access which renoise: No such file or directory

Now iv got this REEEAAAALLLLLLLYYYY big feeling im doing something blinding obvious wrong here, but as a linux guru once told me its not about knowing how to fix it, its knowing what your looking for.

Anyone care to help or point me to a thread??

BRAP! Thats the stuff, thanks for the string as well, im on a laptop with a uk layout so the back ticks are hidden above the tab key…i should have looked harder at the original FAQ!