A 'System Timer Resolution too low' dialog pops up when I click the yellow alert triangle icon in Rosegarden.

Entering sudo modprobe snd-rtctimer from terminal did not work
(received message FATAL module snd_rtctimer not found).

I have read Ubuntu Studio supports better real-time processing than
normal Ubuntu so decided to upgrade from Ubuntu 10.10 to Ubuntu Studio
using the following from the commandline:

'sudo aptitude update && sudo aptitude install ubuntustudio-desktop ubuntustudio-audio ubuntustudio-audio-plugins ubuntustudio-graphics ubuntustudio-video linux-rt'

Lots of audio/video applications were installed, but linux-rt was not
present, so the netresult = Ubuntu + new audio applications.

Googled and found '[ubuntu_studio] Ubuntu Studio 10.10 no RT kernel'

We are just beginning using Rosegarden here and have no experience of
computer-aided composition and recording, MIDI, synthesizing,
sampling etc.

What is the effect on Rosegarden of not having real-time?
Would it matter for beginners like us?

P.S. The PC is an oldish 1.8GHz AMD Athlon with 512MB DRAM that was quite
literally gathering dust until I gave it a last chance and installed Ubuntu 10.10
a few days ago. Is this spec too slow for Rosegarden without RT kernel support?
What newer computer spec is likely to work? 64-bit OK for Rosegarden?