This amp switcher works exactly as advertised. You can send a single input signal into any combination of 3 outputs. Switching is quiet even with amps cranked. LEDs let you know which lines are active. The only reason a battery or power supply is necessary is for these indicator lights. The switching functions fine without any juice. Some fancier pedals have internal transformers for buffering, and switches for phase alignment. These feature make those pedals more expensive than this one. Maybe my ears (shattered by years of multi-amp extravaganza) just are not sensitive enough to catch subtle phase interactions, or maybe I'm just lucky in my amp combining. If you are firmly convinced that your multi-amp rig (with this pedal) is out of phase you can always reverse the speaker polarity on one of them. Anyhoo...this pedal works fine, is well made, and is a good value.'Read full review
Verified purchase: Yes | Condition: New
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