Features already done:

- Internal clock with manual control.
- Clock in socket with amplifier to handle weaker (&lt;6v) signals
- Clock out socket, with option to send to 16-pin cable when nothing is plugged into it.
- Manual one-step-forward via momentary push button.
- CV out, with switch for two different ranges (e.g. 0-2.5v / 0-5v)
- Gate out, with probably +12v gates.
- Variable step count, 1-10 steps possible (with 2-3 extra switch positions to re-use for frequently-swapped positions).
- External reset via socket.
- External reset via momentary push button.
- Play continuously or play once (switch to select mode, then use manual reset button to run once)
- Pause sequence and resume - a function of the run/stop switch.  Will hold open the gate of the last step and output CV continously while paused.
- Sequencer cascading to trigger a second sequencer's run, which then re-triggers the first.

More feature ideas:
- Trigger out - could be done with a capacitor / resistor pair, see Fireball's hard sync input.
        - But could also be done at the module that requires a trigger-sized pulse on input.
- Portamento (aka slew rate controller aka glide).
        - Knob version fairly simple.
        - CV version maybe possible, but a much bigger circuit.  Haven't found a simple implementation.  Can be done externally with a more complex module, several variations on the classic "Maths" module exist for modifying a CV in complex ways.
- CV in to pause the sequence.

Probably can't do, or impractical:
- CV-controlled clock.  Presumably the CV in controls the clock rate?  Possible in the digital realm, or perhaps an external CV-to-pulse-rate module?  Is this even useful?
- Seven-segment display.  Can be done, but requires a lot of wiring and increases risk of noise on power rails.

Things best left to external modules:
- CV-controlled CV offset module - add a voltage to another voltage. Useful here for pitching up from a base.


UI:
  - 11 potentiometers
  - 13 SPDT switches (many used as SPST)
  - 2 momentary pushbutton switches
  - 1 rotary switch, 5+ positions
  - 10 LEDs
  - 6 sockets

Potentiometers:
  - One potentiometer per step, to set output voltages. (10)
  - One potentiometer for internal clock rate.

Switches:
  - One SPST switch per step, to enable/disable gate per step. (10)
  - One multi-pole rotary switch to set number of steps.  Exact configuration TBD.
  - One SPDT switch to adjust CV output range, switch between 5v and 2.5v max (or whatever is configured).
  - Momentary-normal-off pushbutton to manually step.
  - SPST switch to disable clock (pause).
  - SPST switch to disable reset (run once).
  - Momentary-normal-off pushbutton to manually reset.
	
LEDs:
  - One per step, to indicate current step.  (10)
	
Sockets:
  - CLOCK in
  - CLOCK out
  - RESET / CASCADE in
  - RESET / CASCADE out
  - GATE out
  - CV out
        
