I mostly use L/R outputs on SD664 to feed IFB-R1a via Lectro LMa ( ta3f to ta5f cable) for director, director's crew and my boom operator. I pan boom to left and all lavalieres to right. (since thats what post production wants). I switch (physically) between L/R output.
But the main problem on field is sometimes ( depending on the condition wind, traffic, etc...) I have to use right output to feed IFB, which is a problem for the boom operator, since he wants to hear the boom mic.
Any suggestions?