Here are the steps to adjust the volume balance:
1. Locate the register switches on your piano accordion. These are usually small levers or buttons located near the top of the instrument, above the keyboard.
2. Identify the register switches that control the melody and bass sides of the accordion. The switches may be marked with labels or symbols indicating their function.
3. Adjust the register switches for the melody and bass sides to achieve the desired volume balance. You can do this by moving the switches up or down to increase or decrease the volume, respectively.
4. Experiment with different settings of the register switches until you find the balance that sounds best to you. You may need to adjust the switches while playing different parts of a melody to ensure that the melody is consistently louder than the bass.
Remember that the specific names, locations, and functions of register switches may vary depending on the make and model of your piano accordion. If you are unsure how to adjust the register switches on your instrument, refer to the user manual or contact the manufacturer for assistance.