Inspired from legendary Pultec EQP-1A.
Passive equalize with Drive.
High boost frequency is selectable from 7-band.
Low boost frequency is selectable from 4-band.
You can sculpt overtone as like using 4 filters and drive.
You can find the new aspect of sound by strong low-end and organic high-end.
Current limitation:
When drive swith is on, output signal has DC offset. So if receiving module is DC coupled and doing boost signal, the audio may be disappeared.
(No problem if receiving module is AC coupled or not doing boot signal.)