Unable to reduce noise and no proper sine wave is generated using LM358
The LM358 is so noisy and has so much distortion that it is not used for audio.
Its datasheet does not even tell you how much noise it produces.
Also, it has trouble producing frequencies above only 2kHz (poor slew rate) and it has hardly any gain at 30kHz.
Use an audio single opamp like an OPA134 instead.

The second opamp in the LM358 is not disabled so it might be producing interference.