AA.1 is straightforward to use. The 1/4″ stereo input amplifies guitar level signals by +18dB, outputting the amplified signal through left and right 1/8″ outputs (use the left output for mono). Left and right 1/8″ inputs attenuate Eurorack level signals by -18dB, sending the attenuated signal through left and right 1/4″ outputs suitable for outputting to guitar level products.