i have an analog synth with stereo line-level outs for each voice. these outs are one single 1/4" jack for each stereo signal, L+R. i want to record each voice separately for editing. the interface im using atm is a focusrite 18i20. my question is: can i record one of these stereo outs from the synth with one interface input or do i need to split the L/R and record each voice in dual mono?