Solenoids and Compressor Connections

If we close the port that connects the compressor to the air muscle so that the air muscle is deflating using the exhaust port but meanwhile, the compressor is still on, will the compressor build up pressure? Or is that what the pressurized barrel does? Does that pressurized barrel reduce pressure applied if a solenoid is closed and the tubing inside has already reached the established pressure?

My partner and I had a new idea where there be a solenoid that opens to the second set to solenoids(that interface with the air muscles). This first solenoid could have the compressor send to an exhaust valve rather than continuing to build pressure when the second set of solenoids are both closed.

I attached a drawing of the new idea. The red line denotes the air tubing while the black would be the electrical.

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