Two people, one note

An original literary non-fiction-style account of helping an organ tuner in a concert hall.

My task was to hold down one key until the tuner called from inside the organ. From my seat, I could see neither her face nor the pipe she was adjusting. Her instructions arrived through an open panel above the keyboard: first a note, then the word 'hold'. I had expected to watch a craftsperson at work. Instead, I was staring at my own finger.

The note seemed steady to me. She asked me to draw out a second stop without releasing the key, and a faint pulsing filled the hall. The two sounds were close without quite agreeing. She adjusted something beyond the panel, stopped and listened. Gradually the pulsing slowed. When it disappeared, she asked me to release the key. She did not explain over the sound; she waited until the room was quiet and then described what I had been hearing.

Half an hour later, I pressed the wrong key. She called for silence immediately. I apologised and hurried to find the right one, but she asked me to take my hand away from the keyboard first. She checked the note she had requested before we began again. Her voice remained level. An uncertain instruction, she said, was something we needed to resolve together.

Before finishing, she came down to the hall and played a short sequence herself. She listened from a seat, returned to the keyboard and repeated it more softly. A single sound was useful for checking a pipe, she told me, but music was what the audience would hear. I had spent the afternoon supplying isolated notes. She was already listening for the concert that would join them.

What do you learn about the organ tuner's approach to her work in this passage?