Corrects weak or strong signals from amplifier effects loop (send & return) to match them perfectly with effects being used. Custom step up/step down transformers correct signal voltage as needed. Accepts mono (Tip/Sleeve, TS) or stereo (Tip/Ring/Sleeve, TRS) connectors in any combination. Internal Ground Reference Switch eliminates grounding hum or buzz. Cold-rolled steel housing, passive design (no power required) & two-year warranty. Features include: · Corrects weak or strong effect loop signal (send & return) · Custom step up/step down transformers correct signal voltage as needed · Accepts mono (Tip/Sleeve, TS) or stereo (Tip/Ring/Sleeve, TRS) connectors in any combination · Internal Ground Reference Switch eliminates grounding hum or buzz · Cold-rolled steel housing, two year warranty