This Module is currently available.
Four-band parametric EQ, 4-channel mixer, line and separate headphone
305 is an output module with a four-band parametric EQ, a 4-channel mixer, line and separate headphone output and a tuning oscillator with 3 selectable frequencies (200/400/800 Hz) and level control.
Demo video:
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These merchants probably sell this module. Huh?