A MIDI controlled 4 voice spline wave table synth using 8 splines per voice and 32 total different splines. Control logic based upon @robertsyrett counter tutorial and his phase synthesis tutorial for the audio. The splines were generated from 5 ms audio converted to splines using @jjthrash Ruby script available on GitHub. Envelopes using A-D-S-R module where the decay is based on frequency. My previous spline envelopes clicked too much.
Overview
| Module | Function | Performance |
|---|---|---|
| Spline Wave Table Synth | 4 voice MIDI synth | 8 splines per wave table step via MIDI gate |
| Pseudo Stereo | create stereo effect from mono input |
buttons knobs |
Spline Wave Table Synth
Input
| Input | Signal Range | Notes |
|---|---|---|
| MIDI | notes | 4 voice polyphony |
Output
| Signal Range | Notes |
|---|---|
| -1 to 1 | Mono out to Pseudo Stereo. |
Controls
| [Knob, Button] | Function | Notes |
|---|---|---|
 |
ADSR envelope controls | an envelope per voice |
 |
button on reset inactive | in one of the other 4 modes |
 |
button off reset inactive | in one of the other 4 modes |
 |
button off reset active | Freeze the spline playing |
 |
button on reset active | Play the 1st spline (0) |
 |
press button to cycle modes | up, down, up/down, random, freeze/reset |
 |
indicates voice gate | green light indicates gate on |
 |
controls direction probability | left down, right up |
 |
indicates which spline played | splines 0 to 7 in wave table |
 |
controls output volume | mono audio output |
Version History
| Revision | File | Notes |
|---|---|---|
| 1.8 | Spline Wave Table Synth v1.8.audulus (614.8 KB) | cleaned up and improved envelopes versus previous release |
Pseudo Stereo
I/O
| Input | Signal Range | Notes |
|---|---|---|
 |
-1 to 1 | audio from Spline Wave Table Synth output. |
| Output | Signal Range | Notes |
|---|---|---|
 |
-1 to 1 | audio out to speaker. |
Controls
| [Knob, Button] | Function | Notes |
|---|---|---|
 |
stereo effect | enable disable |
 |
fine knob control | enable disable |
 |
set stereo width | symetrical |
 |
set delay time | for both channels |
 |
set feedback | for both channels |