For a swinging Input version I was thinking of modifying a White graphic EQ. I could divide it into four “bands” with the top and bottom bands being cut and the middle two bands being boost.
I think I’d just need to remove the inductor from the high frequency sections and the capacitor for the low frequency sections. The user interface would be rotary switch frequency select and gain.
I think I’d just need to remove the inductor from the high frequency sections and the capacitor for the low frequency sections. The user interface would be rotary switch frequency select and gain.