afx-01

AFX-01 Sequencer

UPDATE

looks like most of this is out of date already :D need to update readme.md with current feature list.

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The beginnings of an open source hardware sequencer project based on the Teensy 3.1 and an Atmel SAM2695 sound chip.

• Hardware (subject to change)

  • Teensy 3.1 Microcontroller
  • Atmel SAM2695 Sound Chip
  • 128x64 OLED Graphic LCD
  • 4x4 RGB LED note indicators
  • 4 vertical buttons
  • 4 horizontal buttons
  • 3x Rotary Encoders
  • 4x mode buttons

• Feature Intentions:

  • MIDI sync
  • Live Arpeggiation Mode
  • Live Sequence Transpose Mode
  • Internal sound generation (with Atmel chip)
  • USB Bus / Battery powerable (external USB probably to start)
  • Eurorack quick mount capability? (dependins on final form factor)
  • Scale Quantization
  • Microtonal Scale Capabilities
  • Perlin Noise based generative sequences
  • Fractional Brownian Motion based iterative microtonal sequences
  • Midi Transforms
    • Pre-Quantized Randomizer
    • Cross-sequence influencer
    • Rotational logic
    • Random Step
    • Perlin noise based step
  • MIDI out
  • CV breakout / addon
    • 3x CV out
    • 3x Gate out
    • 3x CC1 out
    • 3x CC2 out
    • 4x Percussion Triggers

VARIOUS NOTES ABOUT THE PROJECT:

Objective To create a device which will allow one to compose music on the fly without a computer, intended to sequence synthesizers in a live or studio setting.

• Simple Sample player

  • ability to play simple instruments to simulate synth sequences
  • sine, square, triangle synth with low pass, band pass and high pass filter.
  • envelope generator for filter and amp
  • sample synth can replace waveforms

• Step Sequencer

  • 256 step sequences possible (16 pages of 16)
  • Each step has 2 parameters
  • Note + modulation
  • Each step can also have variable length
  • Step 1 can be two beats long, while step 2 can be one beat
  • Each sequence can be measured in beats or steps
  • a 16 step sequence can be 16 beats long, or have 2 beat - steps and be 32 beats long
  • Each step can trigger another sequence
  • Each sequence trigger has parameters
  • Step 1 can also trigger a

• Each Set of Sequences - The controller of time

  • Can have up to 16 simultaneous sequences
  • Master Sequence (default is first sequence made, but can be - changed)
  • Retrigger for each sequence
  • Play once, retrigger with master sequence
  • Loop and retriever with master sequence
  • Loop with no retrigger for euclidean polyrhythms
  • Time modifiers for each sequence
  • Each sequence - The controller of melody
  • Default note length
  • Default scale lock (scale + mode)
  • Tempo
  • Time signature (dictates step length + measure length)
  • Length in beats (max 512?)
  • Type (Step Sequence, Euclidean)
  • Methods
  • Sequence Copy
  • Random setting
    • Type (regular random, 1st order perlin, 2nd order perlin etc - etc
  • % chance of random trigger

  • of choices for random influence

  • scale = multiplier of random influence - based on ableton - random midi patch
  • Repeat type (Mirror repeat - random will repeat in reverse on every other measure, based on previous measure)

• Each Step - The controller of sound

  • Step type
    • Note or sequence
  • Note Type:
    • Can trigger 5 notes n0..5 - on midi it will send each note. - If voice is monophonic, these can be used for arpeggiators
    • n0 = 0-127 note to trigger
    • n1 = Chord note 1
    • n2 = Chord note 2
    • n4 = Chord note 3
    • µT = micro timing in 1/16th of a beat time positive or - negative values?
  • Each note has a length, which is inherited from the sequence - object
  • Sequence Type
  • Sequence to play - choose from memory bank - with preview