Your audio amplifier has many stages with a lot of gain. Then many attenuators. You end up with reduced bandwidth and distortion.
Your circuit has many transistors at max gain without any negative feedback. You should have used negative feedback to reduce the distortion. Attenuators do not reduce the distortion.
My simulation shows a high voltage gain and 40% distortion.
The second half of my sim has much less distortion due to negative feedback but the gain is reduced.