Yes, our VSLOT is compatible with 4-channel receivers like the Lectrosonics DSR4 or the Wisycom MCR54, because such receivers does not output four channels on the 25-pin back panel in analog style but rather in digital AES format. The two AES pairs with two channels each can be routed out of the VSLOT with the normal TA5F-to-XLR breakout cable, or any other cable with two symmetrical channels.
In case your camera does not support digital audio input and you need to rely on analog audio, the receiver will only output two channels on the back while channels 3 and 4 can be accessed through the TA5F connector on the front panel of the receiver.