Focusrite

https://tapeop.com/interviews/109/focusrite-frankenstein/

https://en.wikipedia.org/wiki/Focusrite

https://www.absolutemusic.co.uk/community/entries/Focusrite-ISA-Pre-amps-%E2%80%93-A-Little-Bit-of-Recording-History

https://reverb.com/ca/item/7012113-focusrite-isa-110-sidecar-90-s-blue?locale=fr

https://www.gearslutz.com/board/gearslutz-secondhand-gear-classifieds/1157737-legendary-focusrite-isa-remote-mic-preamps-system-electric-lady-forte-console.html

https://www.gearslutz.com/board/high-end/1081804-npng-isa-110-your-thoughts.html#post11853700

https://www.gearslutz.com/board/showpost.php?p=309819&postcount=4

http://thermalrelief.com/tta001/ surround compressor