Basic Resonance Potion Development Materials Provides 1,000 Resonator EXP.

A potion that can slightly enhance the user's frequency perception ability. It is especially beneficial for Resonators struggling with mastering their Fortes, as it greatly enhances adaptability. However, when consumed by Resonators who already exhibit excellent control over their Fortes, its effectiveness is somewhat diminished due to its fully diluted nature.
Sources
Quests
Huanglong Exploration
Simulation Training
Gladiator's Portrait