One source of confusion, however, was the toggle switch, which we had to move to the microphone setting (which includes a preamp) for proper operation.
然而，混乱的根源之一是拨动开关，这是我们不得不麦克风设置适当的操作（包括前置放大器）。
Each channel has a channel signal switch, high-performance microphone input amplifier circuit.
各通道设有通道信号切换开关，话筒输入设置高性能放大电路。
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