Retro AS-1 supports both ProTools TDM and ProTools LE.
There are now two ways of connecting the audio output from Retro AS-1 to ProTools, DirectConnect and RTAS. To use DirectConnect, place the 'Retro AS-1 DC' plug-in in the 'Plug-Ins' folder of the 'DAE Folder' in your 'System Folder'. You must also change the 'Retro AS-1' control panel audio IO to 'DirectConnect'.
To use RTAS, place the 'Retro AS-1 RTAS' plug-in in the same 'Plug-Ins' folder of the 'DAE Folder' in your 'System Folder', and select 'Plug-in' for the 'Retro AS-1' control panel audio IO.
Make sure you understand which plug-in you have copied to the 'Plug-Ins' folder and set the 'Retro AS-1' control panel accordingly.