Hello everyone,
This is my first post on the forum and I am new to electronics, so please forgive me if I make any mistakes.

I am building a simple guitar tremolo controlled by a mechanical switch (PHONE) that switches using the rotation of a DC motor driven by a dedicated BUY board.
However, the audio output signal is disturbed by a sort of loud “click” with a constant frequency of about 1Hz, which prevents me from using the circuit.
There are also low-volume, high-frequency hums, probably related to the BB construction and poor circuit optimization.
What could this “click” be related to?
Are there any inaccuracies or improvements that can be made?

Here is some additional information:
- The TL072 integrated circuit allows me to manage the WET/DRY output signal correctly.
- The D2 diode is not mounted.
- I think I will replace the 7805 with a 7809.
- The IN and OUT filters are currently represented without any real criteria.