You can't get at the DS2416 from the Sonar console. You have to use a Cakewalk DirectX plugin which creates a seperate console for the DS2416. For some reason Cakewalk does not include it on the CD so you have to download it (http://www.cakewalk.com/revolver/audiox/axdspf.htm). You should also read this document (http://www.cakewalk.com/support/docs/dspaudiox.html)
Erich