Good, it works.
Your frequency is extremely low at 8.69Hz so your 'scope shows the peak detector output voltage ramping down between half-wave pulses.
Try removing Q3 and/or R14 to remove the Automatic Gain Control compression. The AGC allows a signal 10 times higher to activate the same LEDs as the lower level.
Do not exceed a peak input voltage of 2.1V which is only 0.276W RMS in an 8 ohm speaker. The value of R9 must be increased to allow higher input levels.
Your frequency is extremely low at 8.69Hz so your 'scope shows the peak detector output voltage ramping down between half-wave pulses.
Try removing Q3 and/or R14 to remove the Automatic Gain Control compression. The AGC allows a signal 10 times higher to activate the same LEDs as the lower level.
Do not exceed a peak input voltage of 2.1V which is only 0.276W RMS in an 8 ohm speaker. The value of R9 must be increased to allow higher input levels.