I have looked into this and see that the volume of the speakers can be adjusted various ways. Assuming you agree that a CRT TV is also a "computer" somewhat (it has a microprocessor), specifically those from the 90s and 2000s, here's an example:
You can raise and lower the volume of the TV's speakers from either the cable box or with the volume controls directly for the TV. You can mix and adjust both of these ... but the volume from the cable box will go through different steps to lower the volume.
Basically, the same applies on computers like x86 and Windows. On Windows 2000 and up you can adjust the volume many ways, such as:
1.from the speaker itself directly sometimes;
2.from the system volume settings;
3.from an app's volume settings, etc.
All of these adjust the sound, but is this a difference of hardware and software sound? I do not understand.