This was Just me on a TR909, plugged into the phono In (yes, were you'd Plug your turntables) and just using the overall volume of the 909 as a way to control the amount of overdrive/ distortion.
The mixer was from an Italian brand that I think it has closed called ESO.
These were great \"non\" expensive mixers which kind of copied the eq out of the old Formula Sound PM90, although reliable was not a word used so often bellow 300€ at the time..