Step Fader

This is a dual sequencer, nothing really new but fun to play with. Oriented to facilitate the interaction of both sequencers in order to get more complex patterns and polyrhythms. Very "hands on" CV source & good complement for more complex digital sequencers like Eloquencer, Performer etc.

There are 3 GLOBAL STYLES:

  • DUAL (2 totally independent 8 step sequencers)
  • PARALLEL (one sequencer with 2 rows of CV and 8 steps)
  • SINGLE (one sequencer with 16 steps)

There are also those PLAY MODES:

  • Normal
  • Reverse
  • Pendulum
  • Random

There are 2 dedicated buttons (and trigger inputs) to change the sequencer behaviour, pressing 1 button will cycle between the play modes, pressing 2 buttons will do it within the global styles.

Each sequencer has:

  • 8 faders & 8 switches (1 per step)
  • 1 master fader
  • 1 switch for manual step & reset
  • clock, reset and mode inputs
  • 2 gate outs (activated with the switches, center position is no gate)
  • 1 cv out (0 +8 volts range, unquantized)

There is also an output which is the sum of the 2 CVs of both sequencers and 2 gate outs which are a combination of both sequencer gate lines, pretty handy if it's being used as a 16 steps single sequencer but also interesting when used in dual style.

8 position rotary switch to control the number of steps of the second sequencer, but also other switch allows to send that "reset" signal to the first sequencer instead of the second one, useful for the single 16 step style or to make both sequencers interact.

It has 2 slew limiter circuits with input and output, so they can be used independently, by default processing the CV out of each sequencer, forcing the slew to the max will give as result like a weird-synched LFO, but also the gate outs could be plugged in to get like rudimentary envelopes.

The first sequencer has CV control over step repetition, there's a switch to select the CV IN or the second sequencer as source for such purpose (the master fader has no effect over this, so the 8 lines of the faders correspond to the step repetition, from 1 clock per step to 8) Than means that when used in parallel style the lower row of faders could control the step duration, Metropolis or System 100m style.

Two jumper in the back of the module allows to use the "mode 2" input as reversed CV sum output, giving a total of 6 CV and 6 GATE outs.

26 HP

  • 53 mA +12V
  • 14 mA -12V

Step Fader partial kit comes with the PCBA, panel, 18 faders and rotary switch, all 128 SMD components populated (resistors, transistors, capacitors, diodes, op-amps)

The firmware has been tweaked by my friend Siniša Kekez, now it runs much faster and last global style & play mode settings will remain after power cycles.

On start-up the sequencer signals the parameters:

Shows the mode 1 on the first upper 4 leds and mode 2 on first bottom 4 leds, waits 1 second.

Shows style (left 4 upper & bottom LEDS for style 1 (dual), right 4 upper & bottom LEDS for style 2 (parallel) and all 16 LEDs for 3 (single, 16 steps)