Harpo
However I saw an article on the Windows web site that suggests it's possible to run 64bit on a 32bit machine. 
Is this possible?

If you really mean 32-bit machine (i.e. the CPU is 32 bit) then you can't install a 64-bit OS (e.g. Windows 8 64-bit) on it - you would be limited to Windows 8 32-bit and hence Sonar X2 in its 32-bit format as well.