I accept Cubase projects or consolidated files with zero start. Send them in whatever source format you’ve been using, do not convert the sample rate or bit depth. Make sure you record in 24 bit or higher. It’s a good practice to clean the Cubase projects from hidden or unwanted tracks. And always include a monitor/rough mix! It doesn’t matter how bad it sounds, it’s only there for us to know that the files are in sync and that nothing’s missing.
Have you recorded your guitars and bass tracks with Di signals? We’re happy to re-amp them if needed.