JoeCo Cello

Controls: Master volume, independent low-latency headphone mixes, talkback

I/O: 2 x mic/line combo inputs (XLR/TRS) with up to 80dB gain, phase reverse, pad, hi-pass filter, 48V phantom, insert sends; 1 x hi-Z instrument input; 2 x balanced line inputs; 16-channel ADAT Lightpipe input; S/PDIF I/O (optical or coaxial); word clock input; 2 x balanced line outputs (stereo master with volume control); 2 x independent stereo headphone outputs; built-in talkback mic; MIDI in/out; class-compliant USB 2.0 to Mac/PC

Notable use: 125dB dynamic range converters with discrete analogue mic preamps 'to bring the classic era of electronics straight to your studio'; designed and built in the UK by JoeCo

Notes: FLAG (major correction to task premise): Cello is NOT a modular chassis+card system. JoeCo's own product page and text ('22 input, 4 output USB 2.0 interface for Mac and PC') describe Cello as a fixed, all-in-one desktop USB interface -- there are no separate mic-pre, converter, or recorder cards for Cello, and no chassis/card architecture exists for this product on joeco.co.uk. The modular, user-installable expansion cards JoeCo actually sells (MADI and Dante) are options for the BBR1MP recorder (see that entry), not for Cello. No Cello 'card' products were created as separate JSON entries because they do not exist. form_factor/rack_units left blank: joeco.co.uk does not state desktop vs rack (third-party retailers describe it as 'desktop', but this is not confirmed on the manufacturer's own page, so left blank per golden rule). dsp='true' for onboard low-latency headphone mixing. price_usd blank: GBP-only/no published pricing on joeco.co.uk.