v1.0.2

Digital Synth PRA32-U v1.0.2

4 Voice Polyphonic/Paraphonic Synthesizer for Raspberry Pi Pico/RP2040

Change History

• v1.0.2: Turn MIDI Thru Off
• v1.0.1: Fix unstable PRA32-U CTRL operation when using Serial MIDI (DIN/TRS MIDI); Fix README

v1.0.1

Digital Synth PRA32-U v1.0.1

4 Voice Polyphonic/Paraphonic Synthesizer for Raspberry Pi Pico/RP2040

Change History

• v1.0.1: Fix unstable PRA32-U CTRL operation when using Serial MIDI (DIN/TRS MIDI); Fix README

v1.0.0

Digital Synth PRA32-U v1.0.0

4 Voice Polyphonic/Paraphonic Synthesizer for Raspberry Pi Pico/RP2040

v0.4.0 (Prototype)

Change History

• v0.4.0 (Prototype): Extend Osc 2 Coarse range; Change Osc 2 Fine curve; Rename "Osc 2 Fine" to "Osc 2 Pitch"; Change LFO Osc/Filter Amt curve; Update Presets
• v0.3.1 (Prototype): Adjust smoothing time when parameters change; Update Presets; Fix LFO Osc/Filter Amt; Other changes
• v0.3.0 (Prototype): Extend Note Number range; Remove drift of Oscillators; Improve Triangle Wave; Change Portamento curve; Improve Filter Low Cut Mode; Rename Filter Mode LC (Low Cut) to HP (High Pass); Modify Filter coefficients; Change EG curve; Extend LFO Rate curve; Change LFO Fade Time; Change Chorue Rate curve; Update Presets; Fix Filter Key Track (Fix problem with strange sound when pitch is outside of note number range); Fix behavior when Portamento is 0 (Off); Other changes
• v0.2.0 (Prototype): Change Sampling Rate to 48000 Hz; Support MCLK for I2S; Support Polyphonic Mode; Extend Filter Cutoff frequency change range to 10+ octaves; Change "Mixer Sub Osc" to "Mixer Noise/Sub Osc"; Add "EG Amp Mod", "Release = Decay", and "Filter Mode"; Enable Osc 1 Shape, Morph, Noise/Sub Osc, and Osc 2 in Paraphonic and Polyphonic Modes; Other changes
• v0.1.0 (Prototype): The first release

v0.3.1 (Prototype)

Change History

• v0.3.1 (Prototype): Adjust smoothing time when parameters change; Update Presets; Fix LFO Osc/Filter Amt; Other changes
• v0.3.0 (Prototype): Extend Note Number range; Remove drift of Oscillators; Improve Triangle Wave; Change Portamento curve; Improve Filter Low Cut Mode; Rename Filter Mode LC (Low Cut) to HP (High Pass); Modify Filter coefficients; Change EG curve; Extend LFO Rate curve; Change LFO Fade Time; Change Chorue Rate curve; Update Presets; Fix Filter Key Track (Fix problem with strange sound when pitch is outside of note number range); Fix behavior when Portamento is 0 (Off); Other changes
• v0.2.0 (Prototype): Change Sampling Rate to 48000 Hz; Support MCLK for I2S; Support Polyphonic Mode; Extend Filter Cutoff frequency change range to 10+ octaves; Change "Mixer Sub Osc" to "Mixer Noise/Sub Osc"; Add "EG Amp Mod", "Release = Decay", and "Filter Mode"; Enable Osc 1 Shape, Morph, Noise/Sub Osc, and Osc 2 in Paraphonic and Polyphonic Modes; Other changes
• v0.1.0 (Prototype): The first release

v0.3.0 (Prototype)

Change History

• v0.3.0 (Prototype): Extend Note Number range; Remove drift of Oscillators; Improve Triangle Wave; Change Portamento curve; Improve Filter Low Cut Mode; Rename Filter Mode LC (Low Cut) to HP (High Pass); Modify Filter coefficients; Change EG curve; Extend LFO Rate curve; Change LFO Fade Time; Change Chorue Rate curve; Update Presets; Fix Filter Key Track (Fix problem with strange sound when pitch is outside of note number range); Fix behavior when Portamento is 0 (Off); Other changes
• v0.2.0 (Prototype): Change Sampling Rate to 48000 Hz; Support MCLK for I2S; Support Polyphonic Mode; Extend Filter Cutoff frequency change range to 10+ octaves; Change "Mixer Sub Osc" to "Mixer Noise/Sub Osc"; Add "EG Amp Mod", "Release = Decay", and "Filter Mode"; Enable Osc 1 Shape, Morph, Noise/Sub Osc, and Osc 2 in Paraphonic and Polyphonic Modes; Other changes
• v0.1.0 (Prototype): The first release

v0.2.0 (Prototype)

Change History

• v0.2.0 (Prototype): Change Sampling Rate to 48000 Hz; Support MCLK for I2S; Support Polyphonic Mode; Extend Filter Cutoff frequency change range to 10+ octaves; Change "Mixer Sub Osc" to "Mixer Noise/Sub Osc"; Add "EG Amp Mod", "Release = Decay", and "Filter Mode"; Enable Osc 1 Shape, Morph, Noise/Sub Osc, and Osc 2 in Paraphonic and Polyphonic Modes; Other changes
• v0.1.0 (Prototype): The first release

v0.1.3 (Prototype)

Overview

• The sound of PRA32-U v0.1 is very similar to that of VRA8-U (type-16) v2.2

Change History

• v0.1.3: Fix Pitch Bend
• v0.1.2: Add I2S_DAC_MUTE_OFF_PIN and I2S_SWAP_BCLK_AND_LRCLK_PINS configurations
• v0.1.1: Fix a bug where 0-velocity Note ON is not processed as Note OFF
• v0.1.0: The first release

v0.1.2 (Prototype)

Overview

• The sound of PRA32-U v0.1 is very similar to that of VRA8-U (type-16) v2.2

Change History

• v0.1.2: Add I2S_DAC_MUTE_OFF_PIN and I2S_SWAP_BCLK_AND_LRCLK_PINS configurations
• v0.1.1: Fix a bug where 0-velocity Note ON is not processed as Note OFF
• v0.1.0: The first release

v0.1.1 (Prototype)

Overview

• The sound of PRA32-U v0.1 is very similar to that of VRA8-U (type-16) v2.2

Change History

• v0.1.1: Fix a bug where 0-velocity Note ON is not processed as Note OFF
• v0.1.0: The first release