There is one obvious faux-pas : when running opamps on a single supply (0 and 15V here) you need a mid-rail generating circuit to bias their inputs.
Both your input and output buffers have 100% positive feedback, that should be 100% negative feedback if you want them to pass audio successfully.
The second TL072 needs DC bias (to mid-rail) on pin5 and doesn't need a cap as large as 470uF to couple the signal in.
I know very little about compressors so will leave critique of that aspect to others.
Both your input and output buffers have 100% positive feedback, that should be 100% negative feedback if you want them to pass audio successfully.
The second TL072 needs DC bias (to mid-rail) on pin5 and doesn't need a cap as large as 470uF to couple the signal in.
I know very little about compressors so will leave critique of that aspect to others.
Thank you very much for your tips. I know that the buffers have their feedback wrong but I haven't already edited the schematic. I will add a bias for the op amps. Do you think that the vca is connected correctly?