Chain is 4 track mixer in Eurorack 14HP format, with volume and pan controls for all tracks.

CHAIN is a compact 14HP Eurorack mixer with four tracks, each capable of accepting either a stereo or mono source. Every track has dedicated level and sine/cosine pan controls for natural positioning within the stereo field. For mono operation, connect the source to the left input and use PAN conventionally; with both inputs connected, PAN adjusts the balance of the stereo source.

Designed as a straightforward, high-fidelity mixing solution, CHAIN features an all-analogue signal path with negligible distortion, logarithmic level controls ranging from 0dB to −60dB, and separate signal and clipping indicators. Protected inputs, overload-protected low-impedance outputs, high-quality Same Sky jacks and Texas Instruments OPA1679 audio op-amps provide reliable operation and clean sound.

https://www.tangeloaudio.com/product/eurorack-chain-module/