How to trigger the Windows volume display?

When the standard keyboard key to increase the volume is hit on windows, a small window appears in the upper left displaying the volume and possibly information about playing media. I am looking for a way to trigger the window without changing the volume status, preferably in an easy to integrate way with Autohotkey.

The most robust way to trigger the media display with minimal impact to playing audio is to save the mute status and volume level, Send a volume button keypress, then restore the mute and volume levels. To prevent a blip of noise when muted set the volume to 0 then press Volume_Down specifically. To avoid unintentional muting at low volumes, use Volume_Up otherwise.

Volume keys are preferred over sending Volume_Mute twice since that approach causes a noticeable gap in the audio.

All code is in AHK v2.

; Trigger the volume/media display without affecting playing audio by hitting
;   `Volume_Up` then quickly resetting the volume. When muted set the volume
;   to 0 and send `Volume_Down` instead to avoid a blip of noise.
^PgUp::{
    volume:=SoundGetVolume()
    muted:=SoundGetMute()

    ; Trigger the display, being careful to not let sound leak out
    if (muted or volume == 0) {
        SoundSetVolume(0)
        Send "{Volume_Down}"
    } else {
        Send "{Volume_Up}"
    }

    ; Reset to the original volume and mute status
    SoundSetMute(muted)
    SoundSetVolume(volume)
}

Related functions to make volume button presses increment by 1% instead of 2% while still triggering the volume/media display:

; Prefix with `$` to prevent self triggering from the `Volume_Up` sent inside
$Volume_Up::{
    ; `SoundGetVolume` returns a float which is rounded to prevent error accumulating
    ; Remove the `Round` if planning to increment by a non-integer value instead of 1
    volume:=Round(SoundGetVolume())

    ; Send a `Volume_Up` keypress to trigger the media display and unmute (if muted)
    Send "{Volume_Up}"

    ; Indiscriminately set the volume manually to volume+1
    SoundSetVolume(volume+1)
}

; Much the same as above, yet when sending `Volume_Down` at volumes <=3 the volume
;   rounds down to 0, triggering mute. To avoid a gap in the audio, can either 
;   set the volume to 4 when (1<volume<=3) before sending `Volume_Down` or
;   manually undo the muting afterwards (if volume > 1). This causes either a
;   brief volume jump or mute blip, respectively.
$Volume_Down::{
    volume:=Round(SoundGetVolume())

    ; Bumping the volume before sending `Volume_Down` to prevent a mute blip
    if(1 < volume and volume <= 3){
        SoundSetVolume(4)
    }

    Send "{Volume_Down}"
    SoundSetVolume(volume-1)

    ; (The alternative approach, delete the volume bump code above when using)
    ;   ; Undo unintentionally triggered mute when initial volume was <= 3
    ;   if(volume > 1) {
    ;      SoundSetMute(0)
    ;   }
}

All of the above code, without the descriptive comments:

^PgUp::{
    volume:=SoundGetVolume()
    muted:=SoundGetMute()
    if (muted or volume == 0) {
        SoundSetVolume(0)
        Send "{Volume_Down}"
    } else {
        Send "{Volume_Up}"
    }
    SoundSetMute(muted)
    SoundSetVolume(volume)
}

$Volume_Up::{
    volume:=Round(SoundGetVolume())
    Send "{Volume_Up}"
    SoundSetVolume(volume+1)
}

$Volume_Down::{
    volume:=Round(SoundGetVolume())
    if(1 < volume and volume <= 3){
        SoundSetVolume(4)
    }
    Send "{Volume_Down}"
    SoundSetVolume(volume-1)
}