It's a long time since I used arpeggiator MIDI patterns in a song but I now have the need. Is there a library in Sonar?  I can't seem to find one.
A while back I remember making arpeggiated noises in Dimension Pro but for the life of me I can't remember how!
Thanks in advance for any help!

Arpeggiator Patterns are in Cakewalk Content. They are loaded in the MIDI/Track Inspector section pointed to by O in the image below:

 

Alternatively: 
It's a MIDI FX (effect) which can be added as to MIDI clip:
e.g,
- from Browser > Plugins > MIDI FX > Arpeggiator ... drag/dop
- by right-clicking the clip Process([Insert]) FX > MIDI FX > Cakewalk FX > Arpeggiator
- drag/drop or right-click insert into Inspector > Clip > Clip FX
 
Doccy

 
[EDIT] Oh - with a re- read I see it's patterns you were after. Only a few Presets in this method.

Thanks guys.
Scook, I've opened and enabled the arpeggiator on a MIDI track, selected a preset and have the track routed to SampleTank3. All the Presets I try seem to be in a major key, is there a way to edit a arp pattern to make it minor?

There is no arp editor but you can add the Transpose MFX or bounce the clips and hand edit the notes.

John, another good set of presets for Sonar are the Alesion Arp Presets (a bit old, but very useful/interesting).
 
See if this Cakewalk link works: http://www.cakewalk.com/Support/Knowledge-Base/20090612/Project5-Free-Stuff 
 
If not, maybe here: http://patcharena.com/downloads/comment.php?dlid=633&ENGINEsessID=82b9c6f50b2b58e69b74082efbe64564
 
 

Cheers Mesh.
John