Skip to content

Latest commit

 

History

History
141 lines (126 loc) · 8.29 KB

README.md

File metadata and controls

141 lines (126 loc) · 8.29 KB
Raw

Digital Synth VRA8 5.1.2

2015-05-30 ISGK Instruments
https://github.com/risgk/DigitalSynthVRA8

Concept

  • 8-bit Virtual Analog (Monophonic) Synthesizer
  • No Keyboard, MIDI Sound Module
  • For Arduino Uno

VRA8 Features

  • Sketch for Arduino Uno
  • Serial MIDI In (38400 bps), PWM Audio Out (Pin 6), PWM Rate: 62500 Hz
  • Sampling Rate: 15625 Hz, Bit Depth: 8 bits
  • Recommending Hairless MIDI<->Serial Bridge to connect PC
  • Files
    • "DigitalSynthVRA8.ino" for Arduino Uno
    • "MakeSampleWavFile.cc" for Debugging on PC, makes a sample WAV file

VRA8.rb Features

  • Simulator of VRA8, Software Synthesizer for Windows
  • Sampling Rate: 15625 Hz, Bit Depth: 8 bits
  • Using Ruby (JRuby), UniMIDI, and win32-sound
    • jgem install unimidi
    • jgem install win32-sound
  • Usage
    • jruby vra8.rb starts VRA8.rb
    • jruby vra8.rb sample_midi_stream.bin makes a sample WAV file
  • Known Issues
    • VRA8.rb uses the full power of 2 CPU cores...

VRA8 CTRL Features

  • Parameter Editor (MIDI Controller) for VRA8, HTML5 App
  • We recommend Google Chrome, which implements Web MIDI API
  • Recommending loopMIDI (virtual loopback MIDI cable) to connect VRA8

Synth Modules

  • VCO 1
    • Waveform: Sawtooth(0), Square(1), Triangle(2), Sine(3),
      Pulse-25%(4), Pulse-12.5%(5), Pseudo-Triangle(6)
    • Coarse Tune: -64(0), ..., 0(64), ..., +63(127) [semitone]
  • VCO 2
    • Waveform: Sawtooth(0), Square(1), Triangle(2), Sine(3),
      Pulse-25%(4), Pulse-12.5%(5), Pseudo-Triangle(6)
    • Coarse Tune: -64(0), ..., 0(64), ..., +63(127) [semitone]
    • Fine Tune: -9.375(58), 0(64), +9.375(70) [cent]
  • VCO 3
    • Waveform: Sawtooth(0), Square(1), Triangle(2), Sine(3),
      Pulse-25%(4), Pulse-12.5%(5), Pseudo-Triangle(6)
    • Coarse Tune: -64(0), ..., 0(64), ..., +63(127) [semitone]
    • Fine Tune: -9.375(58), 0(64), +9.375(70) [cent]
  • VCF
    • Filter Type: LPF, Attenuation Slope: -12 [dB/oct]
    • Cutoff Frequency: 488.3(0), ..., 971.2(42), ..., 1963.8(85), ..., 3906.3(127) [Hz]
    • Resonance: Q=0.7(0), Q=1.4(127)
    • Envelope Amount: 0(0), ..., 50.4(64), ..., 100(127) [%]
  • VCA
  • EG
    • Attack Time: 10(0), ..., 98.2(42), ..., 1018.3(85), ..., 10000(127) [ms]
    • Decay Time: 10(0), ..., 98.2(42), ..., 1018.3(85), ..., 10000(127) [ms]
    • Sustain Level: 0(0), ..., 50.4(64), ..., 100(127) [%]

Preset Programs

+------+------------------+
| PC # | Program Name     |
+------+------------------+
|    0 | Sub Osc Lead     |
|    1 | Saw Lead         |
|    2 | Square Lead      |
|    3 | Synth Pad        |
|    4 | Synth Bass       |
+------+------------------+

MIDI Implementation Chart

  [Virtual Analog Synthesizer]                                    Date: 2015-05-30       
  Model  Digital Synth VRA8       MIDI Implementation Chart       Version: 5.1.2         
+-------------------------------+---------------+---------------+-----------------------+
| Function...                   | Transmitted   | Recognized    | Remarks               |
+-------------------------------+---------------+---------------+-----------------------+
| Basic        Default          | x             | 1             |                       |
| Channel      Changed          | x             | x             |                       |
+-------------------------------+---------------+---------------+-----------------------+
| Mode         Default          | x             | Mode 4 (M=1)  |                       |
|              Messages         | x             | x             |                       |
|              Altered          | ************* |               |                       |
+-------------------------------+---------------+---------------+-----------------------+
| Note                          | x             | 0-127         |                       |
| Number       : True Voice     | ************* | 24-96         |                       |
+-------------------------------+---------------+---------------+-----------------------+
| Velocity     Note ON          | x             | x             |                       |
|              Note OFF         | x             | x             |                       |
+-------------------------------+---------------+---------------+-----------------------+
| After        Key's            | x             | x             |                       |
| Touch        Ch's             | x             | x             |                       |
+-------------------------------+---------------+---------------+-----------------------+
| Pitch Bend                    | x             | x             |                       |
+-------------------------------+---------------+---------------+-----------------------+
| Control                    14 | x             | o             | VCO 1 Waveform        |
| Change                     15 | x             | o             | VCO 1 Coarse Tune     |
|                            16 | x             | o             | VCO 2 Waveform        |
|                            17 | x             | o             | VCO 2 Coarse Tune     |
|                            18 | x             | o             | VCO 2 Fine Tune       |
|                            19 | x             | o             | VCO 3 Waveform        |
|                            20 | x             | o             | VCO 3 Coarse Tune     |
|                            21 | x             | o             | VCO 3 Fine Tune       |
|                            22 | x             | o             | VCF Cutoff Frequency  |
|                            23 | x             | o             | VCF Resonance         |
|                            24 | x             | o             | VCF Envelope Amount   |
|                            25 | x             | o             | EG Attack Time        |
|                            26 | x             | o             | EG Decay Time         |
|                            27 | x             | o             | EG Sustain Level      |
+-------------------------------+---------------+---------------+-----------------------+
| Program                       | x             | o 0-4         |                       |
| Change       : True #         | ************* | 0-4           |                       |
+-------------------------------+---------------+---------------+-----------------------+
| System Exclusive              | x             | x             |                       |
+-------------------------------+---------------+---------------+-----------------------+
| System       : Song Pos       | x             | x             |                       |
| Common       : Song Sel       | x             | x             |                       |
|              : Tune           | x             | x             |                       |
+-------------------------------+---------------+---------------+-----------------------+
| System       : Clock          | x             | x             |                       |
| Real Time    : Commands       | x             | x             |                       |
+-------------------------------+---------------+---------------+-----------------------+
| Aux          : Local ON/OFF   | x             | x             |                       |
| Messages     : All Notes OFF  | x             | o             |                       |
|              : Active Sense   | x             | x             |                       |
|              : Reset          | x             | x             |                       |
+-------------------------------+---------------+---------------+-----------------------+
| Notes                         |                                                       |
|                               |                                                       |
+-------------------------------+-------------------------------------------------------+
  Mode 1: Omni On,  Poly          Mode 2: Omni On,  Mono          o: Yes                 
  Mode 3: Omni Off, Poly          Mode 4: Omni Off, Mono          x: No