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The Alesis MMT-8 (well, two of them, actually) have been at the heart of my live setup since 1998. Sure, they look like an 80s office calculator or fax machine, but they are legendary in the hardware sequencer community for a reason - hands on, easy to edit, and fun to use. They do have their limitations, but they get the job done in spades.
My first sequencer...Still own it, but no operative because need replace the lithium battery, and use SONAR form my composition needs. But It was my favourite gear for many years.