Snare snappy not working

Discuss Yocto construction and related issues
  • A good night and I found the issue. Transistor Q48 was dead.
  • Unfortunately I still have an issue with the decay/envelope of the white noise of the snare drum.
    The first part of the decay seems correct but a slight noise remains in the sound for some time.
    The waveform measured at R184-R185-C52 point shows some offset or slow decay:
    Image

    If I add a 1 Mohm resistor in parallel to C52, the issue is resolved.

    Do you have an idea about the cause of the issue? Could it be a problem with C52/100nF capacitor?