2015-05-30 ISGK Instruments
https://github.com/risgk/DigitalSynthVRA8
- 8-bit Virtual Analog (Monophonic) Synthesizer
- No Keyboard, MIDI Sound Module
- For Arduino Uno
- 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
- Simulator of VRA8, Software Synthesizer for Windows
- Sampling Rate: 15625 Hz, Bit Depth: 8 bits
- Using Ruby (JRuby), UniMIDI, and win32-sound
jgem install unimidijgem install win32-sound
- Usage
jruby vra8.rbstarts VRA8.rbjruby vra8.rb sample_midi_stream.binmakes a sample WAV file
- Known Issues
- VRA8.rb uses the full power of 2 CPU cores...
- 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
- 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]
- Waveform: Sawtooth(0), Square(1), Triangle(2), Sine(3),
- 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]
- Waveform: Sawtooth(0), Square(1), Triangle(2), Sine(3),
- 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]
- Waveform: Sawtooth(0), Square(1), Triangle(2), Sine(3),
- 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) [%]
+------+------------------+
| PC # | Program Name |
+------+------------------+
| 0 | Sub Osc Lead |
| 1 | Saw Lead |
| 2 | Square Lead |
| 3 | Synth Pad |
| 4 | Synth Bass |
+------+------------------+
[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