Can you point me to a description of what the audio qualities are of the different op-amps that can be ordered?

NE5532: Widely used and highly cost-effective, this operational amplifier (op-amp) offers balanced and versatile sound quality, making it a popular choice for entry-level audio products.

JRC4580D: Commonly found in audio amplifiers, music players, and sound systems, suitable for general music enjoyment and entertainment applications. It is known for providing relatively neutral and balanced sound, preserving the authenticity of music.

Sparkos SS3602: Often used in high-end headphone amplifiers, this op-amp chip is highly regarded among audiophiles. It delivers natural, rich overtones, comfortable listening experience, and a refined, intricate background. It widens, deepens, and heightens the soundstage, conveying a sense of luxury and leaving a lasting impression.

MUSES02: Renowned for its warm sound signature reminiscent of tube amplifiers, this chip offers a softer, endlessly enjoyable listening experience.

OPA2604AP: Known for its superior audio dynamic range and detail resolution compared to other chips, it excels in revealing the subtle nuances of music.