This Module is currently available.
Effects loop for incorporating external effects units into your modular system
The Q201 FXLP (Effects Loop) provides a convenient way to integrate external effects (stomp boxes, rackmount units, etc.) into your MU patch.
Synth level signals can be very large (reaching up to 10V peak to peak or even higher). These signals may be too large for some external effect circuits, leading to overdriven inputs.
The Q201 offers adjustable attenuation of the input signals via its SEND outputs. After the signals pass through external effects or stomp boxes, they may need to be amplified back up to blend with synth level signals. The RETURN section provides this adjustable amplification.
The RETURN section also offers a polarity switch in case the signal polarity has been reversed within the effects chain.
Affected signals are then blended with the dry signal in the BLEND section. The dry/wet blend is CV controllable.
Switching jacks in the INPUT and RETURN section allow the Q201 to be used in mono, mono to stereo, or full stereo mode.
https://shop.synthesizers.com/products/q201-fx-loop?_pos=1&_sid=835ece40a&_ss=r
These merchants probably sell this module. Huh?