React Synth

Monophonic Synth with two sub oscillators and a few effects to make it fun. There is also an oscilloscope and frequency spectrum analyser because they look neat.

Effects

Portamento (Glide)

This determines the time that the oscillator and subs take to glide to the next note. (More of a parameter than a full effect really)

Parameters

• Time - Time to glide to the next note

Vibrato

An LFO linked to the frequencies of the oscillator and two subs

Parameters

• Rate - Frequency of the LFO
• Depth - The range of the pitch modulation

Distortion (Drive)

A Waveshaper node used to distort and beef up the signal

Parameters

• Distortion - Sets the distortion curve applied
• Dry/Wet - Amount of dry and wet signal

Filter

A biquad filter used to adjust the frequencies coming through and shape the sound

Parameters

• Type - Select for the filter type
• Cutoff - Sets the target frequency for the filter
• Q - Sets the resonance of the filter
• Attack - Sets the attack time for the filter envelope
• Decay - Sets the decay time for the filter envelope
• Env Amt - Sets the amount and direction that the envelope adjusts the filters frequency

Delay

A delay module that feeds the signal back after a specified delay time

Parameters

• Time - Sets the delay time for the feedback signal
• Feedback - Set the gain for the signal being
• Tone - Sets the frequency for the delay node's lowpass filter
• Dry/Wet - Amount of dry and wet signal

Bit Crusher (Crush)

Using ScriptProcessorNode to simulate bit depth reduction (this is a deprecated method and will be fixed)

Parameters

• Depth - Selects the bit depth to simulate
• Dry/Wet - Amount of dry and wet signal

Reverb

Convolver node used to add some neat reverb effects

Parameters

• Type - Selects different impulse responses for the convolver node
• Dry/Wet - Amount of dry and wet signal

Node connection order

Vibrato LFO -> Osc + Subs -> Distortion -> Filter -> Gain Env -> Delay -> Bit Crusher -> Reverb -> Master Volume -> Out

Future Ideas

• Currently working on a sequencer to link to this
• One or two general-purpose LFOs that can be assigned to different effect parameters
• A master tempo and a way to sync effect rates like delay time and vibrato speed
• Allow users to save presets
• Master Peak/Gain Meter
• Visual representation of the gain envelope (and maybe filter envelope)
• Super future idea (that may be another synth entirely) would be to make it polyphonic