Benefits
Playing "absolute notes" is to use only the outside three rows for the right hand and to play only one button for a specific note. Generally use three fingers, one for each row of buttons.
In other words, play the chromatic button accordion as you do the piano accordion, that is, each note is a specific key.
The advantage is to associate a specific button with a specific note. This patterns the muscles and the brain to one position per note.
The Practice
The first note to memorize is middle C. Get where you can automatically put your finger on the "C" button.
Now play all of your music exclusively using this approach until you mentally and physically know the position of every note and note pattern.
When you fumble for a note, stop and play that note correctly several times.
Continue to do this for every note you miss.
Continue to do this until you no longer miss notes. This may take several weeks depending on how much you practice.
The goal is to eliminate the tendency to finger an incorrect button.
