XPS 17-9700, Recording level control problems

Hello!  I would love some feedback from anyone who has or is experiencing the same problems I am while trying to record stereo audio using line-in audio sources.

Using audio recording software on two different Dell laptops is producing inconsistent results.  My desire is to record in stereo and have control of the line-in recording volume on my XPS 17-9700 using the analog line-in jack or the USB line-in port.  My older Inspiron 15R does an OK job but I want to use my newer and faster XPS 17.  The audio source is the pre-amp output of a Carver C-1 stereo preamplifier.  The XPS has Realtek/MaxxAudioPro audio drivers.  The Inspiron has Conexant SmartAudio HD drivers.

Here is the current situation with both machines:

Dell XPS 17-9700

Software used: Audacity 3.4.2 and Ashampoo Music Studio 9

USB input – software volume control does NOT work and recording is mono, i.e., left audio signal is recorded on both channels and at low level.

Line input – software volume control does NOT work but recording is stereo at low level

Software used: Ocenaudio* with WASAPI input

USB input – software does not have input volume control.  Records in mono, i.e., left audio signal is recorded on both channels and at low level.

Line input – software does not have input volume control.  Records in stereo but at low level.

Dell Inspiron 15R (5520)

Software used: Audacity 3.4.2

USB input – software volume control works. Recording is in stereo.

Line input – software volume control does NOT work but Windows 10 Start>Settings>System>Sound>Input>Line In>Device Properties>Volume setting does work, although it's awkward.  Records in stereo

Software used: Ocenaudio* with WASAPI input

USB input – software does not have input volume control.  Records in stereo.

Line input – software does not have input volume control.  Records in stereo.

Software used: LP Recorder (circa 2003)

USB input – software has input volume control.  Records in stereo.

Line input – software has input volume control.  Records in stereo.

• Note: Ocenaudio does not feature a software input volume control.

So I'm just wondering if the XPS is incapable of adjusting the incoming line-level signal in any event.  And if not, is there any current Dell laptop that IS capable?  Or should I try a different manufacturer at this point?

Thanks for any advice and/or suggestion!

Pat