3 channel stereo mixer.
All channels start with an overdrive unit.
After which the volume can be set (thus enabling attenuation of the overdriven signal). Setting volume (and modulating it) can be done linear or exponentially.
Following is a filter unit which can switch between low, band and high-pass (or switched off).
This signal can then be panned in the stereo field and send to an external (stereo) effects processor.
Additionally each channel has a power switch (mute) and a level meter indicating with red when the output signal exceeds -8 dB.