Hohner MR 250 Analog Sound Module

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The analogue module came onto the market in the early 1980s. 

The unit has analogue circuits with Curtis CEM 3391 chips (24 dB low-pass filter) and SSM 2024 chips (VCA). Rhythm, Bass, Group 1, Group 2, Preset 1, Preset 2 can be controlled with rotary knobs. The sounds are all preset and not programmable.