Hi @Richard, there’s a github repo showing how to do this in C# at the first link below (this is called the bare_metal interface). The second link is a forum user (@IDC_Dragon) that put together some demo code in Python for streaming to the DAC. I think he got the various attenuators working too as I recall.
I run my code on PC and Mac machines. Is there any reason why the QA403 would not work with a Mac (again, running my own software)?
It should work. The QA403 isn’t a standard USB type. It’s just raw streams that you read/write. And every OS allows you to open bulk streams to a random USB devices and stream away.