Can a FET be used to switch signals?

Question

Arduino

Greetings!
To replace the old amplifier, I decided to solder a new one (power amplifier on TDA7294 + preamplifier with microprocessor control on Arduino Uno\Nano). I ordered all the elements from China, I'm waiting.
One question remains:
After all, it is possible to use field-effect transistors for switching weak (input selector) and strong (output selector) signals? After all, it has practically no resistance in the open state. And it opens from a few volts in total - that is, it is enough to apply a logical unit to the gate.
But how to connect it? All field effect transistor circuits - used to turn on the load (two figures from above)

Then, by analogy, you can use this for sound (I drew a picture below) - a logical unit is applied to the "1" contact, the field workers open and the signals begin to pass from "2" to "3" and "4" to "5" contacts ?
Or do I need to make some adjustments for the sound?
Tell me please! Thanks in advance!

Answer 1

That's right, do it.
You can play Proteus first

Answer 2

After all, it is possible to use field-effect transistors for switching weak (input selector) and strong (output selector) signals?

For the weak - not only possible, but necessary! Moreover, for this, back in ancient Soviet times, bidirectional analog keys with digital control were produced - ICs 176LE1 and 561KT3:
You just need to make sure that the level of the switched analog signal at any time does not go beyond the Upit key. Surely now there are foreign keys with even better characteristics and more convenient to use (although much more convenient...).
But as for switching powerful outputs, everything is more complicated. Powerful amplifiers can have tens of volts at the output, and how can one ensure bidirectionality (for alternating current) and "not going beyond the Upit key"? It is possible, of course, but the key circuit grows at the same time, and one IC is not enough here.

Answer 3

Something you have Arduino ground connected to the negative pole of the load.
So it shouldn't be connected. Because with this connection, you get a voltage difference between the load ground and the Arduino ground of 12 volts. If you try to ground such an Arduino device, it will immediately fail.