First E chord on guitar, then on piano and finally on computer. Recorded with Iphone 13 using the app "Röstmemo" (voice memo). The app creates M4A-format (MPEG-4 audio). I convert to wav. Mono recordings. Recordings normalized -3dB. I use ChucK to make a chord on computer. The script to generate the tone of E looks like this: SinOsc e => dac; .1 => e.gain; 329.63 => e.freq; 6::second => now; I record the sound from lap top speakers.