Let's add a headphone jack to SF-2000 DatFrog

In this tutorial, I demonstrate step by step how to add an input socket/jack for your headphones. A great upgrade for your SF-2000.
Materials:
two resistors (1K) 1000ohms;
pcb on/off switch ( you can find it in an old devices like bluetooth speakers)
3.5mm Stereo headphone jack;
At Amazon, Aliexpress etc search by:
"3.5mm stereo audio jack pcb"
"resistor 1k"
"switch on-off pcb"
Some links below, but be careful, I don't sell them or know the seller. Just use them as a basis for searches:
3.5mm stereo jack:
pt.aliexpress....
www.amazon.com...
switch On Off:
pt.aliexpress....
www.amazon.com...