求购用于贝斯，吉他，键盘，电子鼓，扩音系统的组合放大器。请回复详细规格和图片。
Combo amplifiers for bass, guitars, keyboards, electronic drums and PA systems. Please reply with full specifications, pictures.
通过键盘设置参数，实现放大器放大增益步进调节、滤波器带通频率步进调节功能。
Its parameters can be regulated by keyboard in order to control amplification and cutoff frequency by step.
通过键盘设置参数，实现放大器放大增益步进调节、滤波器带通频率步进调节功能。
Its parameters can be regulated by keyboard in order to control amplification and cutoff frequency by step.
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