  Audio envelopes serve a crucial role in ensuring the versatility of
synthesizers in producing timbres. To this end, the Attack, Decay, Release and
Sustain (ADSR) envelope generator and its derivatives have been established as
a mainstay in modern music. However, there may be merit in exploring alternate
techniques to produce envelopes that could not only resemble ADSR but also be
used to create novel timbres. Consequently, an attempt is made in this research
to formulate the framework of a new envelope generator by redefining the
Proportional-Integral-Derivative (PID) algorithm used in feedback-based process
control. Additionally, a detailed analysis is made on the modes of operation
and the nature of envelopes thus generated to establish it as a potential
harbinger of distinctive styles of music.
