The Cumulus Vintage Overdrive is a pedal that is based on the Ibanez OD-855 Overdrive II, which was released in 1977. This pedal was designed by Maxon and released under the Ibanez name. It features a diodes-to-ground clipping setup, similar to the MXR Distortion+, and is known for being the first appearance of the Tube Screamer tone control.

The Cumulus is a direct adaptation of the original OD-855, but with the JFET switching removed to convert it to true bypass. It also includes a clipping switch that allows you to select between the stock clipping diodes and two other options. The updated version of the Cumulus is the same as the earlier 1590B version, but with a modified clipping switch that allows for the use of LEDs as the third diode option in the center position.

Overall, the Cumulus Vintage Overdrive offers a vintage overdrive tone with the added flexibility of different clipping options. It is a faithful recreation of the original OD-855 and is a great choice for players looking for that classic Tube Screamer sound.

Summary created by AI from the original source.