This is due to the small valued capacitor (.1uf) feeding the output. The output cannot be anything but a distorted squarewave except at the highest freq. 5V drop and then the second transistor will have an optimal (Vbat/2) +- voltage swing possible with the 9V battery and give you the best and symmetrical squared waveform fuzz sound. 6ma through the 8.2k resistor creates approx. 6mA to flow through the fuzz pot (1k) to develop this bias voltage. For the circuit to work properly, the base of the input transistor must be biased at approx +. The overload cutting out of sound might just be due to a bad (weak) 9v battery. Make sure you have the polarity correct of the electrolytic capacitors in your circuit. The fuzz pot has to have some big effect on the sound or you have a wiring problem around the pot, a short somewhere.
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