That's how the other two Resonance Tuners get around the black market without people knowing their true capability. There are many devices with Tuner in its name.
Origin of the Tuner in Resonance Tuner:
-Tune as in the music the device play
-The meaning of Tuning: The adjustment of a system to secure optimum performance.
-That Tuner which tuning musical instrument
-Tuner-Monsters from Yu-gi-oh (which use another monster used to bring out stronger monsters).
If I use the original name for Resonance Tuner... the secret behind it would be spoiled