You said: electro harmonix moleThe Electro-Harmonix Mole Bass Booster is a specialized, single-knob effects pedal designed to heavily boost low-end frequencies. Originally a classic EHX design, the modern Nano-chassis version was sold between 2009 and 2020 before being officially discontinued. [1, 2, 3, 4, 5]Core Functionality

• Low-End Gain: Delivers up to 20 dB of clean boost strictly focused on low frequencies.
• Frequency Range: Targets a center frequency band from 400 Hz down to 200 Hz at maximum volume.
• Low-Pass Behavior: It actively filters out high and treble frequencies. Turning it on creates a dark, "subterranean" tone similar to vintage Gibson EB-0 neck pickups.
• Volume Interaction: If the boost knob is rolled completely to zero, it mutes the entire signal. [1, 2, 3]