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"The MTG Pro One Turbo replacement CPU Module is a drop-in replacement microcontroller for the Sequential Circuits Pro One's 8021 CPU (AKA P8021/8021H/P8021H).
Features:

Non-destructive FLAT pins. We don't use square pins that destroy the CPU socket.
Supports the original functionality including the sequencer and arpeggiator.
Each sequence can be up to 256 steps (compared to total of 40 steps on the original).
Sequences are retained in memory even after power-down. The CPU module does not use a battery.
Power-on settable parameters for clock start mode, arpeggio up/down end notes, arpeggio down mode and arpeggio gate time.
Sequence Tie mode allows for a variety of note lengths.
Sequence End mode lets you chain the two sequences.
Non-destructive FLAT pins. We don't use square pins that destroy the CPU socket."
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