This Pedal is currently available.
Analog active signal mixer, Line selector
● Analog active signal mixer, Line selector.
● two working modes: parallel and series.
● Three channels can be freely selected.
● True Bypass Circuit keeps a clean Signal Path.
● Working with 9V Center Negative Regular Pedal Power Supply
Portal is an active signal mixer with two working modes: parallel and series. In parallel mode, the signal mixer has two send/return loops and one main output, which can combine three independent inputs into one, or can be used as an active ABY as needed. In series mode, A and B are series channels. When the A/B switch is closed, channel A or B is bypassed. When all three switches are closed, it is true bypass.
https://www.sonicake.com/collections/dual-footswitch-stompbox/products/portal#product-modal