Stem01
Record the piano clearly
Use a direct digital piano recording or place a microphone near the acoustic instrument. Avoid clipping, and turn off heavy reverb when you can. If you already recorded the performance, select a short phrase with a clean start and finish.
02
Look for overlapping notes
Load the excerpt and read the roll from low notes to high notes. Stacked notes indicate pitches that overlap in time. Check a chord attack, the quietest note and the end of a sustained passage before downloading the result.
03
Refine the performance
Compare the MIDI against your audio or score. The tool estimates velocities and note ends but does not recover the sustain pedal as a controller track. Adjust voicing and pedal separately in your DAW.