I use it and it's pretty simple. There are 2 ways, the first one you already got it, using it as a pre amp effect direct to input. I use the TC digital output to Neo.
The other way is to use it as external effect. You connect the Neo sends to TC inputs as you can do with any effect processor, the only difference is that each TC input has a different function, as you know, working as 2 mono inputs, one stereo out. This way you have each TC channel working separately (this is the TC architecture). You need a adapter to connect Neo to the TC MIC input. Keep connected the TC output (analog or digital) to Neo in. That's it. Then you can send any track to any TC channel. TC Main channel can be used as vocal effect and AUX Channel can be used as a guitar effect or what ever. This is a excellent way to try and add TC additional voices.
I use a little complex architecture. I use 2 digital mixers (Event EZBus and Roland M-1000). The Neo sends goes to the EZBus, EZBus Send goes to TC digital in and the TC digital output goes to M-1000, M-1000 digital out to Neo digital in. This way I can choose how to use TC just setting the sends on the EZBus. By the way, almost all digital. Just the Neo sends are analogs. All my analogs are connected to EZbus that send digital to M-1000 and then Neo. All my digitals goes to M-1000 (keyboards,effects).
It is a home studio I use one but one method to record on Neo and this way works perfect to me and I never have to connect anything on my studio, I just route the things using sends on the mixers and Neo. EZBus is (was) a excelent mixer and analog/digital router (includes A-DAT), a lot of inputs and a lot of outputs.
Adding: I also have a Boss SE-70 (analog) connected on EZBus (send and returns). So I can chose where I going to send Neo on EZBus,
Voiceworks or SE-70 just patching it on EZBus. And, My Mic is connected straight to analog TC preamp, I select analog for MIC and digital as external processor on TC panel.