Thankyou ssooooooo much David. That works perfectly!!!!

I'm trying to get my pi zero running headless. I've followed the instructions here and can get it to load a patch on start up. I get audio from the usb audio when I have a screen connected by hdmi. When I start up with no screen attached I get no usb audio. Sorry I'm pretty new to all this. Any help would be much appreciated

Hi again. I got it working so ignore my question. I just copied anything with lib into the pd_ndi folder and that did the trick. Thanks so much for the amazing external!!

This is the error i keep getting.
C:\Users\matt\Documents\Pd\externals\pd_ndi\pd_ndi.dll: The specified module could not be found.
(126)

Hi. This is exactly what i need! I've been trying to install the compiled version for Windows but can't get it to install. Can you tell me what you mean by the 'library file'? Any other ideas what I could be doing wrong? Thanks in advance.