Question

My StudioLive 64S Series III won't work for all instruments connected to the network stagebox. No Preamp adjustment for all Network connections to the stagebox on the StudioLive series III

Answer 1

Make a support ticket, they should be able to help you out.

https://support.presonus.com/hc/en-us/articles/210050813-How-to-submit-a-Support-Request-

Answer 2

Looks like you do not have your console configured correctly for the NSB device you are using.  Make sure you have the correct AVB sends setup on your console.  When setting up the connectivity, the AVB sends (the AVB numbers) will be different than what the console uses.