Check the listing for details. MusicomLAB SI-01 System Interface Dual Buffer for Pedalboards. Condition: New. Listed at 145.00 USD. NOTE: We are the Musicom Lab Authorized Dealer in the US. Make sure you are buying from an Authorized US Dealer to be able to access warranty service in the US. New MusicomLAB SI-01 System Interface Dual Buffer. The SI-01 features Two high-quality buffers. The First buffer is based on Discrete Class-A circuitry. The Second buffer is based on a Low-Noise Op-Amp. The SI-01 System Interface prevents loss of signal level, high frequency and low end punch that is caused by impedance mismatch and cable capacitance. Some Fuzz or Wah pedals don’t like to be fed with a buffered signal. For this reason, the first buffer can to be bypassed. You can avoid Ground Hum/Noise that may occur when two buffers are used for different signal routing, because the second buffer is supplied with a fully isolated power supply. Powered by 9VDC(center negative) 45mA Dimensions : 72(W) x 113(D) x 31(H) mm 2.9(W) x 4.5(D) x 1.2(H) inches Weight : 180 g / 0.4 lb _gsrx_vers_1547 (GS 9.4.2 (1547))