https://www.worldofmusic.com.au/effects/boss-eq-200-graphic-equalizer/
Boss EQ200- Boss EQ-200 Graphic Equalizer - World of Music
The Boss EQ200 is the most flexible compact EQ ever created for guitar and bass. The frequency centers of all 10 bands can be set to three different types.
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https://www.worldofmusic.com.au/effects/boost-eq-and-compressor/boss-ge-7-7-graphic-band-eq/
Boss GE-7 7 Graphic Band EQ | World of Music
The GE-7 Equalizer pedal offers seven bands of EQ ranging from 100Hz to 6.4kHz, ideal for guitar sounds, with boost/cut of +/- 15dB per band.
bossgegraphicbandeq
https://www.guitartraders.com/38733
Maxon GE-01 Graphic EQ - GUITAR TRADERS - ギタートレーダーズ
graphic eqguitar tradersmaxon
https://hackaday.com/2025/11/28/usb-dac-comes-with-graphic-eq/
USB DAC Comes With Graphic EQ | Hackaday
usb dacgraphic eqcomes