This Pedal is currently available.
3 channel mixer
The Bit Mixer is a small, high-quality mixer designed for pedalboards. It features ultra-low distortion, low noise op amps. High-impedance inputs are designed for guitar, but work with line level signals as well. Each input has a volume knob that goes from off to unity gain.
The Bit Mixer is always on when power is connected. An internal LED is visible below the power jack.
Usage
Connect multiple instruments to one amp
Combine parallel effects chains
Clean blend or analog dry path
Specs
Size: 4.4" x 2.6" x 1.5"
Input impedance: 1 MΩ
Output impedance: < 1 kΩ
Frequency response (± 3 dB): 20 Hz - 40 kHz
Signal-to-noise ratio: 90 dB
Power: 9-18 VDC
Current: 60 mA
These merchants probably sell this module. Huh?