I've just ordered a second QRX (I already own one with IFB Option), but I wasn't able to get infos from my seller about the usb cable to link the receivers in order to use the one with the ifb transmitter for them both. Actually, I also asked Zaxcom (no detailed info on the user guide too) but it seems they don't provide that cable. So, is there someone here that use this configuration and would tell me which is the cable and connector parts required for the matter?   Thanks, v.