Includes 10x tone board preamp with adjustable treble, alto, and volume controls. The board layout is designed for low noise with careful component placement to meet demanding expectations. Equipped with an opamp IC package socket for flexible upgrades, enabling easy changes to suit different listening tastes. Key benefits Enhanced tonal control: gain precise adjustment of treble, mid (alto), and overall level to shape your sound. Lownoise performance: thoughtful layout and component placement reduce noise and ensure cleaner signal. Upgradefriendly: standard opamp socket allows you to try different opamps to tailor the sound. Specifications and compatibility Tone controls: treble, alto, and volume Preamp type: tone board with 10x preamp capability Connectivity: uses a socketed opamp IC package for easy upgrading Design focus: reasonable board layout with low noise and clean component arrangement 23 use scenarios DIY audio preamp enhancement: integrate into a home stereo or DIY audio project to achieve more precise tone shaping and level control. Custom sound experimentation: swap opamps via the socket to explore different sonic character and dynamics. Vintage or modest gear upgrade: improve tonal flexibility and signal cleanliness in older amplifiers or interfaces without a major redesign.