Windows PowerShell script to control Blackmagic ATEM audio mixer using a MIDI device

ATEM Audio MIDI Demo.ps1

# Sample script to control Blackmagic ATEM audio mixer using a MIDI device

# This script only runs on Windows 10 and ISE 64bit
#Requires ATEMLib.dll and PeteBrown.PowerShellMidi.dll
# which can be downloaded from https://ianmorrish.wordpress.com
#
# Blackmagic ATEM Software Control must also be instaled (v6.4 or grater)
#ATEM setup

add-type -path 'C:\Users\imorrish\OneDrive\PowerShell\ATEM\SwitcherLib.dll'
$Global:atem = New-Object SwitcherLib.Switcher("192.168.1.8")
$atem.Connect()
$audio = $atem.GetAudioInputs()

#MIDI setup
# Device ID is for Behringer CMD MM-1

Import-Module 'C:\Users\imorrish\OneDrive\PowerShell\Midi\PeteBrown.PowerShellMidi.dll'
$deviceId = "\\?\SWD#MMDEVAPI#MIDII_B5FB4C9F.P_0001#{504be32c-ccf6-4d2c-b73f-6f8b3747e22b}"
[PeteBrown.PowerShellMidi.MidiInputPort]$inputPort = Get-MidiInputPort -id $deviceId
$inputPort.TranslateZeroVelocityNoteOnMessage = $true;
$noteOnSourceId = "NoteOnMessageReceivedID"
$controlChangeSourceId = "ControlChangeMessageReceivedID"
Unregister-Event -SourceIdentifier $noteOnSourceId -ErrorAction SilentlyContinue
Unregister-Event -SourceIdentifier $controlChangeSourceId -ErrorAction SilentlyContinue

function logScale($level){
    if($level -ne 0){
        20 * [System.Math]::Log($level)
        }
    else{
    -66
    }

}

#offset applied to inputs so we can control 8 (or more) inputs from single controler.
$global:g=4 

$HandleNoteOn = 
{
    switch ($event.sourceEventArgs.Note) {
            16{$global:g=0;write-host "Control inputs 1-4";break}
            17{$global:g=4;write-host "Control inputs 5&6";break}
            48{$audio[0+$g].InputGain=-66;break}
            49{$audio[1+$g].InputGain=-66;break}
            50{$audio[2].InputGain=-66;break}
            51{$audio[3].InputGain=-66;break}
            19{if($audio[0+$g].MixOption -eq "bmdSwitcherAudioMixOptionOff"){$audio[0+$g].MixOption="On";} else {$audio[0+$g].MixOption="Off"};write-host "1 $($audio[0+$g].MixOption)";;break}
            23{if($audio[1+$g].MixOption -eq "bmdSwitcherAudioMixOptionOff"){$audio[1+$g].MixOption="On";} else {$audio[1+$g].MixOption="Off"};write-host "2 $($audio[1+$g].MixOption)";;break}
            27{if($audio[2].MixOption -eq "bmdSwitcherAudioMixOptionOff"){$audio[2].MixOption="On";} else {$audio[2].MixOption="Off"};write-host "3 $($audio[2].MixOption)";;break}
            31{if($audio[3].MixOption -eq "bmdSwitcherAudioMixOptionOff"){$audio[3].MixOption="On";} else {$audio[3].MixOption="Off"};write-host "4 $($audio[3].MixOption)";;break}
            20{$audio[0+$g].MixOption="FollowVideo";break}
            24{$audio[1+$g].MixOption="FollowVideo";break}
            28{$audio[2].MixOption="FollowVideo";break}
            32{$audio[3].MixOption="FollowVideo";break}
        }
}

$HandleControlChange = 
{
    switch ($event.sourceEventArgs.Controller)
    {
        48{$audio[0+$g].InputGain=logScale($event.sourceEventArgs.Value/127) }
        49{$audio[1+$g].InputGain=logScale($event.sourceEventArgs.Value/127) }
        50{$audio[2].InputGain=logScale($event.sourceEventArgs.Value/127) }
        51{$audio[3].InputGain=logScale($event.sourceEventArgs.Value/127) }
	}
}

#Start event receivers
$job1 = Register-ObjectEvent -InputObject $inputPort -EventName NoteOnMessageReceived -SourceIdentifier $noteOnSourceId -Action $HandleNoteOn
$job2 = Register-ObjectEvent -InputObject $inputPort -EventName ControlChangeMessageReceived -SourceIdentifier $controlChangeSourceId -Action $HandleControlChange

write-Host "Started"

Demo video of script in action.
https://youtu.be/rIW_97YYxlA