For a sequencer, hexinverter.com has made this project even to beginners. Some of the parts should probably be sourced from Mouser.com so that they fit the pcb just right. I have made a modifications for external reset control and external pause control. I don't use these features often, but they are nice to have around. I have chosen to omit the internal clock of this module as I will be using an alternative clock source.
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Sequencer

Features:
- 1 to 8 steps of analogue control voltage and gate
- Reset/Pause input
- Reset selection via step toggle switches (down = reset)
- 5V/10V simultaneous outputs for Gate/CV level selection
- Clock syncing
- Note on/off switches
- Flexible single DC power supply (9-15V)

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Brian Tuley
Electronic Engineer Brentwood, CA