I can say, "Alexa, set volume on laptop 90" to set the volume to 90 percent, or Alexa, turn off volume on laptop" to mute it.

@echo off

if "%1"=="" goto :usage
if "%1"=="on" goto :on
if "%1"=="off" goto :off
goto percent

:on
echo Unmuting volume
nircmd mutesysvolume 0
goto done

:off
echo Muting volume
nircmd mutesysvolume 1
goto done

:percent
set percent=%1%
echo Setting volume to %percent% percent
set /a "num=65535*(percent %% 101)/100"
nircmd setsysvolume %num%
goto done

:usage
echo %0 on, off, or 1-100
echo For example, these commands will mute the volume:
echo %0 off
echo %0 0

:done
echo Done.