Studio Balanced Line input module / zSUM-4 expander.
zLINEIN provides two balanced 1/4" (6.35mm) line inputs, including RF filter, active servo DC suppression and zero-impedance output driver with adjustable gain (20dB max) and short-circuit protection.
Purchase from official dealer: https://sssrlabs.com/store/motovilo_zlinein/
http://motovilo.com/zsum-4/zlinein/
This Module is currently available.
$70