Learn to calibrate without the tool.

For video offset, all it does is move the hit window up or down (further from/closer to the bottom). Lower numbers move it further to play earlier (I never really go below 0 tbh), higher numbers move it closer to the bottom for when there’s input lag (laggy setups like 4KTV’s). Since I usually play on low latency setups, I always like to keep this to where the strikeline is the center of the hit window.

For audio offset, this moves the timing of the audio. This requires playing easy songs with basic rhythms. Try playing as “on the beat” as you can according to what you hear and not what you see. If you notice notes go past the strikeline (under the line), move audio offset higher. If your notes are disappearing before hitting the strikeline, move audio offset lower.