Personally I find it pretty bad, huge "POCK" every time you use an amp interuptor to change, nothing to control the sound mass. After c is on robust, but it's not top-level use, when you're there no way of knowing what will be the amplifier A or B will be activated when you disable the famous Y (the two LEDs are lit ... why not three diodes 1A, 1B and 1Y ???). Brief strongly discouraged, I fell back on a real system rather midi type ground control voodoo lab or just a system or Lehle amp selector (still voodoo lab)