Editing Boss DS-1 (section)

===Circuit design===
The DS-1 has a very simple circuit, based on a single [[Operational amplifier|op-amp]]. The distortion is produced using a variable gain circuit with diodes shorting the output to ground to produce hard [[Clipping (music)|clipping]] of the input waveform similar to the [[Pro Co RAT]] distortion pedal. This distortion stage is followed by a passive tone filter and volume control. The tone control is scooped in the midrange. It consists of a simple fixed -6dB/oct low pass filter and a simple fixed -6dB/oct high pass filter using a potentiometer to mix the two signals.
Given this, the sound of the pedal has what can be described as a "nasal" tonal quality. Its simple circuit makes it a popular pedal to modify amongst DIYers, with much information and schematics available online.
Notable companies offering modified versions of this pedal include Keeley, JHS, and Analogman.