According to various online posts, the Soundcraft Notepad line of mixers tends to develop various faults of the USB audio inteface after a few years, including constant noise. Fortunately, if you can live without the digital parts of the mixer, there's a workaround.
A reflection-based approach to calling `WriteWarning`, `WriteVerbose`, and other PowerShell output methods from anywhere in your .NET code outside the cmdlet, without passing callbacks.