The Bass Boost control gives a continuous control over the amount of bass using a unique ‘varislope’ curve which peaks at 65Hz.
The Bass Cut is a high pass filter which turns into a shelving type curve that will also increase in frequency as the switch is advanced.
The ‘MID/HF’ boost control gives a bell type curve with variable gain peaking at either 2.5KHz / 4KHz or a ‘varislope’ curve peaking at 12KHz, all selected by the frequency select switch.
The ‘MID CUT’ control provides a bell type curve centred at 1KHz with continuous control over the amount of cut.
These controls are intended to interact with the other EQ controls for a very flexible control over the entire frequency range.
The ‘LPF’ or low pass filter switch control will allow the high frequencies to be cut at a frequency suitable to stop harsh sounding harmonics standing out when excessive distortion is used,smoothing the resulting sound.