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Adding the Capacitor Between Pins 1 & 8 Increases GAIN, so it will also Increase Noise.
If you do use this Capacitor, Also put in the Bypass Capacitor from pin 7 to Ground
If you Don't need the Extra Gain, Don't use that Capacitor from pins 1 to 8.
You should also have a 100uf Capacitor Between Pins 6 and 4.
If your Using this with HEADPHONE, you should have a RESISTOR In SERIES with the Headphones to Reduce Power and Noise.
For 8 Ohm Headphones a 100 Ohm Resistor is good.
For 32 Ohm Headphones a 390 Ohm Resistor is good.
The noise is probably acid rock or RAP "music".
Maybe the input is a microphone and the sound goes around and around due to acoustical feedback howling.
Maybe the volume control is turned up too high causing severe clipping distortion.
Maybe the battery is almost dead and causes severe distortion on peaks or motorboating noise.
I wonder why the noise was not described?
RAP is a guy whose ancestors came from Africa, reading a book in a nasal voice with a boom-boom beat in the background. Just noise.
Did I say what I think about Country Hee-Haw music or an electric geetar that has severe fuzz?