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this auction"In 1980 Roland released a new Digital Sequencer called the CSQ-600. It was an expanded version of the CSQ-100 which had been released the year before, with improved sync facilities and more memory. However it still fell short of the powerful MC-4 Micro-composer that Roland had launched 2 years earlier, but the CSQ-600 was considerably cheaper, at under £1000. It was frequently paired with Roland's analog monosynths like the SH-2, and it sold in higher volumes than the expensive MC-4. The CSQ-600 is strictly CV/gate, as it pre-dates MIDI by four years. It can store up to 150 notes into each of 4 separate tracks or parts, making for a total memory of 600 notes. Unlike the MC-4, it can only replay one track at once and there is no way of backing the sequences up to cassette. It does have a battery backed memory though, unlike the CSQ-100, so at least your 4 sequences are retained!"