說明書裡[Solid State]Control的說明是這樣： This control adjusts the input signal gain of the solid state circuit. Turning the control cockwise increases only the volume. At the maximum position, gain is about +6dB. This can be used to increase the gain for the signal before effect processing. 所以換言之那個鈕是個Boost嗎？如果不是，那是拿來幹啥用的呢？ 懇請有使用G9的大大幫忙解答摟