Saturated analog clipping that combines Hard (crtage the circuit ground) and Soft clipping (crtage asymtrique-cons in the raction). If you look at the Schematic circuit there are two saturation parallle with a balance between the two (the famous button color).
We will not add too much says it all t prcdement.

UTILIZATION

Easy, no need to add here either.

SOUND QUALITY

The quality of basic boss.
I use it occasionally on the bass with the disto cot knob and the gain almost to the mini, has given a lightweight crunch that highlights the shot mdiator.
On guitar, overdrive alone is a little rickety (not low) and rough (?), The distortion is only crmeuse or soft, but the main Intrets is shuffled the two that can give rsultats nice (adapting SETTING THE Tone.
This helps make the distortion a little less soft or soften the overdrive.

OVERALL OPINION

The intrt of the pedals is the Swiss Army knife cot, especially if you do not know if prfre distortion or overdrive.
It does not rev any good but it has its place in the bag for the guitar dpanner from time to time, we can find a use for his (mostly rock), and that on any amp .
Used in good state in 30 or 40 euros is made.