From Modest Mike’s Mods 

Modified Behringer V-Tone Bass BDI 21

From Behringer:

Combining DI functionality with tube emulation circuitry, the Behringer V-Tone Bass Driver BDI21 puts a massive array of vintage tube amps right at your feet. Use the Blend control to mix the amount of tube emulation you want with your bass guitar's direct signal, or stomp on the BDI21 for some straight-DI tone. Your sound can then be shaped to perfection with dedicated Drive, Treble, Level, and Presence controls. Whether you want to pop and slap, play some smooth funk, or create some overdriven mayhem, the Behringer V-Tone Bass Driver DI BDI21 will take you there.

I got this email a while back:

Hi! I'm interested in having mods done to a Behringer BDI 21 to bring back the mid range by               defeating the internal bypass and notch filters. There is a YouTube video that shows how to do this (FrankenP Behringer Bass BDI 21 Pedal Mods, Demo, and How-to) using two toggle switches.

FrankenP Behringer Bass BDI 21 Pedal Mods, Demo, and How-to

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Someone in the comments section mentioned they used a pot to adjust the mids. Would it be possible for you to do this in place of this toggle switch?                                                                    

So I did these mods: 

-Drilled & installed a toggle switch- down position for stock, up position for bandpass filter bypass gain reduced. 

-I also drilled and installed a potentiometer instead of a toggle switch for mids control.

Here's what John had to say: 

Received the Behringer pedal. As soon as I saw the new switch & knob I knew it was professional work. Would've got back to you sooner but unfortunately I did not get a chance to test it until the other day but I gotta say, it sounds great! Also brought my little amp to life. If I ever need anything pedal mod related I'll be sure to contact you for more service. 

Want one?