Always on, so you're always sounding the way you want.
From Old Blood Noise Endeavors, the 3-Band EQ + Buffer pedal is an always-on buffer and switchable 3-band EQ with sliders. The buffer is helpful for long cable setups or when using an overabundance of pedals. The EQ is helpful in tailoring frequencies to specific parts, guitar switches or using it as an always-on EQ. The buffer is always on, and the On/Off switch only activates/deactivates the 3-band EQ.