Not having tested realtime IO on Windows for a while, I
was shocked to confirm that there is indeed some issue
with input audio. I was getting a train of clicks  when running
Csound5 with ASIO.

But hey, I found out why!

It just happens that -b has to be a multiple of ksmps. I have not
checked the code, but it's simple. With -b512 and ksmps=100,
clicks are there, but with -b100 (or -b200), the sound is perfect.

Try it out.

Victor Lazzarini
Music Technology Laboratory
Music Department
National University of Ireland, Maynooth