The Tascam MM-1 is a vintage 20-channel, 2-bus line/keyboard mixer released in the late 1980s. It is designed specifically for electronic musicians and synth setups, featuring MIDI-programmable muting, a compact 19-inch rack-mountable footprint, and multiple auxiliary sends and returns to handle dense multi-keyboard rig configurations. 

Key Specifications & Features

• Inputs: 16 main line channels plus additional stereo auxiliary inputs (totaling up to 20 inputs).
• MIDI Muting: Programmable MIDI mute automation allowing users to store and sequence mute scenes.
• EQ & Controls: Simple two-band equalization per channel with pan, level, and assign buttons.
• Auxiliary: 4 aux sends and 4 stereo aux returns for heavy external effects routing.
• Form Factor: Compact desktop or 19-inch rack-mounting design (with removable rack ears). 

• Workflow: Highly prized in retro synth and electronic music setups for summing multiple line-level hardware instruments down to a stereo pair without taking up massive desk space. 
• Tested-no known issues. Slight scratches as shown in pictures.
• Original power supply included