I like your taste in female vocalists 
IME, comparing active devices vs. true bypass can be a disappointing exercise. Even $$$$ devices such as TOTL preamps clearly alter the signal if directly compared to bypass.
Loki is a reasonably priced device with many parts, each of which can and will impart its own signature, even something as simple as the pot used. Still, one can minimize the negative effects and maximize the benefits by minimizing signal path, e.g. use RCA adapters instead of extra cables.
