Practice here is a loop the app runs with you: play a passage, be told which bars went wrong, and play it again at a tempo that follows how you did.
A score can carry its own arrangement for each level, and the app plays it when it does. When it does not, the app derives one by rules that only ever remove notes, and a derived arrangement can be kept in the score file so it is not derived again.
A clean repetition steps the tempo up and a failed one drops it back. Choose the hands, whether the other hand accompanies or stays silent, and whether each repetition is counted in. Claude starts the same drill with practise.
Latency calibration clicks about a dozen times while you strike along, and takes the median for that device, so an audio driver’s delay is not graded as yours.