Often that Vcc/2 voltage is from a simple voltage divider and capacitor, no regulation needed because the load is constant. That reduces part count and eliminates any regulator noise addition.

 

Are you referring to the LDO in the original schematic? Yes, it is indeed a bit excessive, I use two 100k resistors for Vcc/2.

 

The Jfet is an N-channel MPF102 but some of then have a cutoff gate voltage of 8V that does not happen with the 6V half-supply voltage.

A problem with this one and most compressor circuits is its reaction time is slow enough to hear a loud blast before it reduces the level.

 

An amplitude clamp added will prevent the loud blast or even a momentary blip. In fact some modulation systems include a multi-level clipper to make the action "a bit gentler."Different diodes with different resistors and different diodes.

 

@Audioguru again
I am using a BF862 with a Vgsoff of -0.8V, in the simulation I had entered it in the fet properties. Truth is, I couldn't perceive the volume change by ear, but I did hear some occasional crackling, but the circuit is unstable and sensitive to movement on the breadboard, so I thought that might be the cause.
@MisterBill2
Do you mean in AGC feedback? How should I implement it?

 

An audio compressor circuit does not use clipping diodes, but ROCK "music" does. Elliot Sound Products shows a very fast compressor circuit.

 

Breadboards cause stability and int

@Audioguru again
I am using a BF862 with a Vgsoff of -0.8V, in the simulation I had entered it in the fet properties. Truth is, I couldn't perceive the volume change by ear, but I did hear some occasional crackling, but the circuit is unstable and sensitive to movement on the breadboard, so I thought that might be the cause.
@MisterBill2
Do you mean in AGC feedback? How should I implement it?

Your Jfet is too sensitive and attenuates everything.
Breadboards cause stability and interference problems.