One of the most important items in an older style E music studio is the pot. There is a well known picture of one of the pots at the BBC Radiophonic Workshop.
These would be pretty cool to have If you record sound or are a high wonk or have a particular super deluxe phaser or loop echo device.
http://diyaudioprojects.com/Solid/DIY-Lightspeed-Passive-Attenuator/
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Gino Wong Birgelo
BSComm, BSEE, CG, ReRED, CSEC
Audio Mastering, Recording & Logistics, Analog Sound Design