The VP29 is used to amplify an RIAA equalized signal from a turntable to a line level and standard equalization.ROLLS ACCESSORIES Rolls accessories are well known throughout the world. We make all kinds of specialty signal adapters, phantom powering devices, a very versatile cable tester, a signal generating device, and more. Many of these "little boxes" are the result of customer suggestions, please contact Rolls if you have any comments.