"The Babyface Pro has two analog microphone inputs that can operate as line inputs with levels
up to +19 dBu, when set to 0 dB gain and PAD active. The electronic input stage uses a
servo balanced design which handles unbalanced and balanced signals correctly, automatically
adjusting the level reference. "
英文说明书第8页/共94页写的很清楚,接1、2口且增益调到0并启动pad时,就是线性输入。