If you are getting the message "Invalid I/O Channels or Audio Device, cannot start session" please check that the parameters you are using for your audio device correspond to the capabilities of the hardware.
On Windows Computers, double check you have complete a proper installation of JACK and that you are using the correct required version.
On Windows, you need to have JACK version 1.9.11_64 installed in the “Program Files” folder prior to installing Groovesetter.
Other versions of JACK will not work with Groovesetter. Uninstall all other versions and reboot your computer before proceeding with a new JACK installation.
Visit this link for a walkthrough on how to install Jack Audio Sound Server API for windows.