Clojurians Log v2

Hello and thanks again. Having a good time and making good progress on my learning of overtone. I noticed that something like: (defsynth left-sine [] (out 0 (sin-osc))) plays on both my left and right headphones on my M2 mac. I checked SuperCollider with a similar script and got the expected behaviour of only one speaker. Is this by design? If so, how do i get a different signals to left and right speakers? Thanks in advance!