Sequential Circuits Max Synthesizer CM620A SN 01266

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via this auction

"This is a used Sequential Circuits Max synthesizer model CM620A serial number 620 01266 from August 1984. It is in good working order and as far as I can tell everything is working. The only two issues of note are that the volume pot is 'dirty' and makes a scratching sound when changed, this could probably be fixed easily, once the volume is set the static sound goes away. The other issue is that the original power supply is a little picky about which outlets it likes, I find it works best when plugged into the wall as opposed to a power strip. Usual wear and tear from 30 years is obvious in the pictures. Biggest visual issues is a ding on the cover near the 2 button (see photos) and the CALIF E0096668 scratched in the back of the unit.

Whats included:

The keyboard
original power supply
original Max operation manual
original Max Midi guide

Here are some general facts about the keyboard-

On the front panel is a single keypad, a single volume knob, buttons for transpose and tune, and 16 buttons used to operate the sequencer. The back panel features a power switch, a power-in jack (8V AC), two phono jacks for stereo out, MIDI IN and OUT jacks, and a Stereo 1/4" main output jack, which doubles as a headphone out.

The Max's strength lies in multitimbrality: 6 voices, 6 oscillators and even 6 VCF's! There are no real-time performance controls - not even pitch bend or modulation wheels. The preset sounds consist of basic organ, string and brass type sounds, but exploring this analog synth can lead to some cool sounds. The VCF, VCA and VCO sections all have separate ADSR envelope generators. The LFO can control the VCO, VCF or VCA. A nice touch are the two separate on-board sequencers - sort of a Sequential tradition."