Oscilloscope: After selecting PSLab MIC, In-Built-MIC does not work when PSLab device is not connected

[arpoch]

Actual Behaviour
On selecting PSLab MIC option before the In-Built MIC option, no popup stating if a PSLab device is not connected, when selecting In-Build MIC no activity can be seen on the monitor.

Expected Behaviour
The PSLab MIC option should be unable when then PSLab device is not connected.

Screenshots of the issue

Would you like to work on the issue?
Yes

[arpoch]

If have applied the changes, and the code is working fine. So should I now make a PR, can any please guide me through the procedure as it's my first PR.

[asaikarthikeya]

Good. Create a new branch and push the changes to that branch. Later make pull request to development branch .

[AsCress]

Superseeded by #2421 and resolved by #2422.