LUNAVERUS

The biggest thing you can do is use a high quality audio recording with as little noise as possible. Modifying an existing audio file (slowing the tempo, etc.) is generally not going to improve the accuracy of the automatic note detection. All audio is internally resampled to 44100 Hz before processing, so using a sample rate higher than that will not help. You can help improve the future accuracy of the software by correcting the mistakes in the automatic transcription and clicking "Contribute File". Thank you to everyone who has done this!