Old Vinyl sound generator.

Features:

* First row of buttons are to turn generators on/off.
* Phase buttons to switch variations position.
* Var: Adjust the level of variation depending of the generator.
* Vol: Volume knobs for each generator.
* Density: Sets the noise density on the clicks, dust and friction generators.
* Main Vol: Main volume of the sum of all generators.
* Fq: Frequency or "tuning" of each generator.