Tracking guitars, I always want to have the option of coming back later to tweak the amp tone and try different mic positions, so I always record a direct in. Reamping with a line signal is a no-no because of the noise, so I decided to get this.
My first order of business was to figure out where unity level was, and for my unit, it was 4.5 ticks away from maximum. Being able to dial in the perfect level and having the visual indicator to be able to set it again is a great feature.
Second thing I did was to run a few tracks from my DAW to the interface -> TRS -> XLR input of the Reamp, and then out through the TS -> back into the interface direct to see just how accurate the signal is.
With the ground lift on and the phase inverted, I was able to get close to a perfect copy of the original waveform. (Yes, with the phase switch off, the phase of the wave coming back in was inverted, so make sure to run some tests!) Running the tracks through my amp, I was very happy to hear very low noise, especially with the ground lift switch engaged, as I've been dealing with ground loop issues during recording and reamping. In my DAW, the copied signal had no noticeable latency when I zoomed in to compare the original direct vs the new signal. Best of all, when I inverted the phase of the copied track and played it with the original, there was barely any sound being played from my DAW which indicated the fact that the waveforms were close enough to each other that inverting one signal would cancel out so much of the other.
I'm very impressed by how accurate this is, and sets my mind at ease because reamping is no longer a compromise on tone!