Here is a rare, vintage,  MXR Limiter pedal. I inherited this from the estate of a friend of my dad's, who was a lifelong jazz guitarist. I am a bassist, but did test this through my bass rig. All the knobs seem to slightly change the tone, and I believe the pedal works as intended. The "Attack" and "Release" knobs were quite subtle (the effect might be more dramatic on guitar than on bass), while the "sensitivity" and "output" knobs affected the tome more dramatically. Both maxed out gave a nice, warm overdrive sound. I have not used a limiter previously, so my experience with what it should sound like is, well,  limited. :)

See pics for details. Thanks for looking!