The LH-042 converts a line signal to a phono signal. What this is good for? Just imagine the following situation. Your working as a DJ and you have recently bought a new line source (a CD player, MP3 player or the like). Now you would like to connect it to your mixer, but the line inputs are already used. What to do? At this point it's time for our LH-042. Just plug it into a phono input and connect your additional line source to the converter: you've got one more line slot for your mixer.
The LH-115 provides the opportunity to perfectly record your voice recordings: Take your microphone signal and send it to the LH-115. With one or two headphones you now can now tap the signal and send it, unaltered, to you computer. From there again you can send another signal, background music for example, back to the mixer. Now you can speak sort of on the music and with the level control you are able to easily set the volume of the microphone signal. On your monitor signal you can thus hear the mix the way you prefer it for recording. And due to its small size, it's the ideal partner on the way.