musical tuning
Refers to the act of tuning musical instruments or adjusting sound to the correct pitch.
Let's tune up before the performance.
Standard kanji spelling for musical tuning.
Variant spelling with 合せ instead of 合わせ.
Compound of 音 (おと, 'sound') and 合わせ (あわせ, 'matching'), from the verb 合わせる (あわせる, 'to match').