I'm moving from WinXP/Cakewalk to an intel iMac and I'm giving Jack/Ardour a try since Audacity for Intel macs is very unstable. Question for folks who hopefully know: Both Audacity and Jack require the creation of "aggregate devices" in the audio set up of Intel Macs. When I try to create a 2 in/2 out aggregate device using Line in and Line out, the device shows 2 inouts but 0 outputs. Jack shows 2 sends but no receiving conections and I can record in Ardour but no playback. Anyone have any idea what's going on? Thanks!