Question

When capture 3.0 is open with a default device of studio live 32sx, created session, click ok, then signal is present on every channel that was armed but when press record no recording is seen only straight line.

Answer 1

Ensure you have given mic access if you are using a Mac.

https://support.presonus.com/hc/en-us/articles/360018329172-No-Audio-Input-on-Apple-OS-X-10-14-Mojave

If its a PC or if the issue remains then please log a support ticket. 

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