Autohotkey - How to adjust volume only of a specific program?

Question

I want to control volume of a specific program and not the whole master volume.

I found THIS thread that has code for controlling only the volume of Windows Media Player from Volume Mixer .

This is the whole script:

SetTitleMatchMode, 3
SndVolWasStarted = 0

;Turn off SndVol after 1 second 
Loop {
  Sleep, 10
  If SndVolWasStarted = 1
  {
    GetKeyState, StateF1, F1
    GetKeyState, StateF2, F2
    If (StateF1 = "D" or StateF2 = "D")
    SndVolStartTime = %A_Now%
      Else {
        If ((A_Now - SndVolStartTime > 1) and WinExist("ahk_class #32770"))
        WinClose, ahk_class #32770
      }
    IfWinNotExist, ahk_class #32770
    SndVolWasStarted = 0
  }
}

;Hotkey to decrease volume
F1::
IfWinExist, Windows Media Player 
{
  IfWinNotExist, ahk_class #32770
  {
    Run, "%A_WinDir%\System32\SndVol.exe" -r 88888888
    WinWait, ahk_class #32770
    SndVolWasStarted = 1
  }
  ToolbarWindowNumber = 322
  msctls_trackbarNumber = 321
  Loop {
    ControlGetText, ControlName, ToolbarWindow%ToolbarWindowNumber%, ahk_class #32770
    If ControlName = Mute for Windows Media Player
    {
      ControlSend, msctls_trackbar%msctls_trackbarNumber%, {Down}, ahk_class #32770 ; Use {Down 2} to change sound level faster
      Break
    } Else {
      If ToolbarWindowNumber < 328
      {
        ToolbarWindowNumber := ToolbarWindowNumber + 2
        msctls_trackbarNumber := msctls_trackbarNumber + 1
      } Else {
        If ToolbarWindowNumber = 328
        {
          ToolbarWindowNumber = 3210
          msctls_trackbarNumber := msctls_trackbarNumber + 1
        } Else {
          If ToolbarWindowNumber < 3242
          {
            ToolbarWindowNumber := ToolbarWindowNumber + 2
            msctls_trackbarNumber := msctls_trackbarNumber + 1
          } Else {
            MsgBox, 16, AutoHotkey, ERROR: Application's volume control was not found!`nThis could occur if the Volume Mixer has more than 20 opened applications
            Break
          }
        }
      }
    }
  }
}
Return

;Hotkey to increase volume
F2::
IfWinExist, Windows Media Player
{
  IfWinNotExist, ahk_class #32770
  {
    Run, "%A_WinDir%\System32\SndVol.exe" -r 88888888
    WinWait, ahk_class #32770
    SndVolWasStarted = 1
  }
  ToolbarWindowNumber = 322
  msctls_trackbarNumber = 321
  Loop {
    ControlGetText, ControlName, ToolbarWindow%ToolbarWindowNumber%, ahk_class #32770
    If ControlName = Mute for Windows Media Player
    {
      ControlSend, msctls_trackbar%msctls_trackbarNumber%, {Up}, ahk_class #32770 ; Use {Up 2} to change sound level faster
      Break
    } Else {
      If ToolbarWindowNumber < 328
      {
        ToolbarWindowNumber := ToolbarWindowNumber + 2
        msctls_trackbarNumber := msctls_trackbarNumber + 1
      } Else {
        If ToolbarWindowNumber = 328
        {
          ToolbarWindowNumber = 3210
          msctls_trackbarNumber := msctls_trackbarNumber + 1
        } Else {
          If ToolbarWindowNumber < 3242
          {
            ToolbarWindowNumber := ToolbarWindowNumber + 2
            msctls_trackbarNumber := msctls_trackbarNumber + 1
          } Else {
            MsgBox, 16, AutoHotkey, ERROR: Application's volume control was not found!`nThis could occur if the Volume Mixer has more than 20 opened applications
            Break
          }
        }
      }
    }
  }
}
Return

I tried it and it works with Windows Media Player but I can't make it to work on Google Chrome.

I changed some piece of code on IfWinExist, Windows Media Player and changed it to IfWinExist, Google Chrome but didn't adjust the volume of Chrome.

I'm running windows 10 64-bit

Answer 1

1. Replace all IfWinExist, Windows Media Player
   with IfWinExist ahk_class Chrome_WidgetWin_1
2. Replace all If ControlName = Mute for Windows Media Player
   with if (ControlName ~= "Mute for.*- Google Chrome")

You can use Autohotkey Window Spy utility to find the values. Rightclick any AHK icon in the taskbar tray notification area and select "Window Spy".

---

Or use the awesome nircmd utility:

^#Up::run nircmd changeappvolume focused +0.1
^#Down::run nircmd changeappvolume focused -0.1
^#Numpad0::run nircmd muteappvolume focused 2

Ctrl+Win+Up = volume up active app
Ctrl+Win+Down = volume down active app
Ctrl+Win+Numpad 0 = mute/unmute active app

Replace focused with app exe name to control a specific app, e.g. chrome.exe, vlc.exe