CSQ-100, I got it with my ARP 2600. The previous owner had some diagrams and patches utilizing the ARP and the CSQ.
The CSQ-100 is a microprocessor-controlled CV/Gate Sequencer. It is the little brother of the CSQ-600. It can only play one note, one sequence at a time. It can hold two sequences of 100 steps in each sequence. Sequences are recorded via an external CV/Gate input or using step-time and can be saved or loaded via a cassette interface. Portamento can be adjusted manually during sequence play-back, it can not be programmed.