The BF2M contains two independent buffers. A high impedance input buffer ensures a constant high impedence load on your guitar at all times, an isolated tuner output, and a low impedence send to your effects. The return from your effects goes into an ultra low noise line driver, which will drive even a very long cable back to your amp without changing your tone or adding noise. The 'M' stands for the mute switch that allows for mute and silent tuning where tuner is connected.
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