For sonar 3 in the system requirement the sound card echo indigo is not supported! you can see in the web site!
Why!
sonar 3 + sound card indigo echo
Did you get the Echo Indigo I/O? It's a input and output card, the normal Indigo doesnt record. If you look at Cakewalk's "supported cards" list, it specifies the IO model further down the row. Easy to miss, perhaps.
-Jayme
-Jayme