Well it was still pretty easy for me, only difference is they have changed the preference menu so hard to find things.
I'll assume you do have the 505 connected correctly and it is in MIDI SYNC which will show on the screen.
Everything you need is in the preference menu, some under "MIDI, some under "Clock"
Under Project- MIDI:
check Transmit MMC
Transmit MIDI start stop MAke sure your interface shows checked in the currently assigned port box
APPLY
In the Clock menu:
Source = Audio
48 ticks
30 FPS ndf
APPLY
Hit play and the 505 light will flash in time to what ever tempo you have set in Sonar.
If you patch the MIDI output cable and point at a blank MIDI track set on omni you can record your patterns as midi events.
I keep my 505 patched in as I find it is a handy way to start a new project with a person coming around with a song idea. Most of these people I work with have used drum machines so don't mind at all.
Without having to record the pattern I simply put the 505 in their headphone mix and have them play their song. It just saves time looking for the right pattern. Mine is still loaded with stuff going back what must be 30 years now. I've never changed the internal battery?
The information on setting up midi sync is in the help files
MIDI - SMPTE/MIDI time code Syncronization