David Ellefson

David Ellefson uses the MXR M80 Bass D.I.+ pedal, as evidenced by a user-uploaded photo on Imgur.

As seen on his Samsontech/Hartke artist page. Megadeth's bass guitarist, David Ellefson is sited using this pedal from the producers of the product.

David Ellefson uses the MXR M134 Stereo Chorus, as shown in a user-uploaded photo on Imgur.

David Ellefson use the ZOOM B3 Bass Effects & Amp Simulator pedal to play at Home or on tour bus during 2012, also he created many of the D patches, one of the them is the D0 patch called Crunch Fuz. Recently, with Metal Allegiance you can see a David´s pic playing with the ZOOM B3 while he plays with Mike Portnoy and Alex Skolnick.

The video is of many in the "David Ellefson's Rock Shop" video collection. The Megadeth bassist mentions and shows the camera that he uses the Peterson StroboStomp2 Pedal Virtual Strobe Tuner.

In this YouTube video for EMG TV, David Ellefson uses his Ashdown Bass Drive Plus during his bass solos. It can be heard at 3:22 and 4:12 gives a tour of his studio. And can be seen at 1:28 next to his pedalboard.

https://www.khdkelectronics.com/artists/detail/david-ellefson/

In this YouTube video for EMG TV, David Ellefson can be seen using a "TC Electronic Polytune 2 Pedal Tuner" in his pedalboard at 1:28.

David Ellefson has a video on his YouTube channel titled "The Providence Dual Bass Station Pedal," in which he plays through the Providence Dual Bass Station bass preamp. At the end of the video, he provides a close-up of the pedal to show his settings.