What to Do If Sound Is Muffled or Too Quiet During Recording (Windows XP)
For Windows XP, normal operation may not be guaranteed because Microsoft has ended support for this operating system. (Reference)
Double-click the Sounds and Audio Devices icon in Control Panel.
The Volume Control window will appear. Click Options, then Properties.
Select Recording, then under Show the following volume controls, check "Stereo Mix" and click OK.
If the sound is muffled, lower the Stereo Mix volume. If the sound is too quiet, increase the Stereo Mix volume.
Since Stereo Mix is a feature provided by the sound driver, on some sound drivers the sound may still be quiet even if the Stereo Mix volume is increased. In that case, you should also increase the system volume.
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Overview of CapturePlus Image Editing Features
This feature lets you easily edit captured images and supports various drawing tools as well as text input tools.
It also includes features such as automatically expanding the image area when you open the selected area in a new window (Ctrl+Del) or paste an image from the clipboard.

After selecting the parts you want from the captured screen, you can copy them to the clipboard with Ctrl + C, open them in a new window, or save only the selected area directly as a file using the Save Selected Area feature.

-Zoom In / Zoom Out: You can also use (Ctrl + Scroll Up) / (Ctrl + Scroll Down).
-Alpha (transparency) values can be applied to drawing tools.
-Provides common drawing tools, shapes, and arrows.
-Supports adding text (including frame and font properties).