The vocoder - how to turn the sound of any instrument or sound source into speech

The vocoder - how to turn the sound of any instrument or sound source into speech
The vocoder is one of the most amazing effects you can use in the studio. It was invented in 1940, but even now hardly anyone has one. Why not?
Source: www.record-producer.com

What is the difference between gain and level? A sound engineer should know...
There is much confusion between gain and level controls. Are they two names for the same thing, or do they have distinctly different functions?
Source: www.record-producer.com