You may be referring to a Sound Mixer, but you need to provide more detail.
A Creeper
music producers and sound engineers
something that electrical engineers invented was the battery.
The square root of -1 is "i". However engineers use "j", but it's essentially the same thing.
Engineers use blueprints so that they can see what the height and width of a object is going to be and how to make it.
engineers
Yes.
Robotics engineers use scientific notation to compute very large or very small numbers.
Building engineers use math to help them figure out how big or how small to make the house or whatever they are building.
Engineers commonly use the IEEE (Institute of Electrical and Electronics Engineers) citation style for their research papers and publications. This style provides guidelines for formatting citations and references in engineering-related fields.
Geometry
ya