jamming/connecting to GH4

I’ve just got my first Tentacle and so far loving what it can do…..but despite managing to jam TC from the Tentacle to a Clockit Slate, a Sony PMWF3 and to my surprise an Ikonoskop DII I cannot figure out how to use it with Panasonic GH4…..so I thought I’d ask here as I’m sure many of you use a Tentacle with that camera. The TC track will not record, the mic track from the Tentacle does record ok on CH’ Right, but Left CH’ gets nothing so there’s a setting or set-up that I’m missing here. Hopefully someone will be able to let me know how to correct this……Thanks!