This is an 2x30 band equalizer (25Hz-20kHz) all that has classic, 3U rack format.
Fader 45mm +/- 12dB, 40Hz low-cut filter and level rglage.
Small VU meter whose First diode is "rgle very low" to dtecter signal presence.
Jack and XLR connectors.
I bought this to replace a dbx equalizer 231, which is a very good machine for its price but still among the range. GF-230 is very above the dbx 231 and a rather comparable 2231. In use, a subjective impression was good Contrle when moving faders, severe cleaner and p chu the dbx 231 which parat a little soft cost. It seems to respond "to the finger and ear."