CORNFIELD ELECTRONICS DuoPoloy User guide

1
DuoPoly
Quick Operation Guide
Version 2.52
Cornfield Electronics

2
Intro
DuoPoloy is a polyphonic music synthesizer that can be played with the
ArduTouch board’s touch-keyboard. It has 8 octaves, Tremelo, Vibrato, distortion
effects, Low Pass Filter, and several interesting waveform voices. It can also be
used as a sequencer. As well as the touch-keyboard, DuoPoly makes use of the
two knobs and two buttons on the ArduTouch board.
DuoPoly was the first synth created for the ArduTouch music synthesizer project.
DuoPoly can be played as a synth, but its main intent was a synth to demonstrate
and show off the sounds and features of the project and the ArduTouch Arduino
library functions.
It can be played alone, but it can be more easily controlled (and understood) if you
use the Arduino Serial Monitor (or, even better, another serial Terminal program).
The pages that follow comprise a reference guide for all of the features of
DuoPoly.
Please see the last page of this document for an explanation of the types of button
presses used on this synthesizer, including “Tap”, “Double-Tap”, “Tap-Press”, etc.

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main>
r right voice
l left voice
k push console's virtual keyboard
p select preset (0, 1, 2, 3, 4)
v set volume (0 to 255)
w select waveform (0, 1, 2*)
* latch oscillator frequencies (geometric)
+ latch oscillator frequencies (arithmetic)
u unlatch oscillator frequencies
x set transposition amount (in semi-tones)
[ start sequencers
] stop sequencers
| pause/resume sequencers
. mute
< unmute
! reset
? display info
ESC or ` exit sketch
* waveform 2 available only for __STNDLONE__ and __BAREBONE runtime models
(continued ...)

4
main
left button right button
Press left voice Press right voice
Tap Tap
Double-Tap exit sketch Double-Tap
volume

5
right> or left>
d detune oscillator (-128 to 127, total range is a quarter tone )
e push envelope control
E push effects chain
f set oscillator frequency (20.0 to 20000.0)
g set glide speed (0 to 255, 0 = off)
k push console's virtual keyboard
S push sequencer
t set sequencer tempo (15.0 to 20000.0)
T push tremolo control
V push vibrato control
v set volume (0 to 255)
w select waveform (0, 1, 2*)
* latch frequency geometrically
+ latch frequency arithmetically
[ start sequencer
] stop sequencer
| pause/resume sequencer
. mute
< unmute
! reset
? display info
ESC or ` return to main panel
* waveform 2 available only for __STNDLONE__ and __BAREBONE__ runtime models
(continued ...)

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right or left
left button right button
Press Press scroll pots
Tap - 1 octave Tap + 1 octave
Double-Tap return to main panel Double-Tap run key menu once
Tap-Press Tap-Press program a sequence
volume
detune
glide

7
Sqnc>
r record a sequence (push step programmer)
t set sequencer tempo (15.0 to 20000.0)
[ start sequencer
] stop sequencer
| pause/resume sequencer
! reset
? display info

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step>
SPACE or . ++duration
z C
s C#
x D
d D#
c E
v F
g F#
b G
h G#
n A
j A#
m B
, high C
0 thru 8 select octave 0 thru 8
? display current octave
ESC or ` commit sequence
left button right button
Press Press ++duration
Tap - 1 octave Tap + 1 octave
Double-Tap commit sequence Double-Tap

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envelope>
a set attack time (0 to 255)
d set decay time (0 to 255)
r set release time (0 to 255, 0 = hold)
s set sustain level (0 to 255)
~ set legato retriggering
' set staccato retriggering
. mute
< unmute
! reset
? display envelope state
ESC or ` exit envelope panel
(continued ...)

10
envelope
left button right button
Press Press scroll pots
Tap -1 octave Tap +1 octave
Double-Tap exit envelope panel Double-Tap run key menu once
attack
decay
sustain
release

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tremolo>
f set tremolo frequency (0.01 to 20.0)
d set tremolo depth (0.0 to 1.0)
t set trigger count (# half-cycles to traverse: 0-255)
~ set legato retriggering
' set staccato retriggering
+ trigger starts af “softest” level, and increases
- trigger starts at “loudest” level, and decreases
. mute
< unmute
! reset
? display tremolo state
ESC or ` exit tremolo panel
(continued ...)

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tremolo
left button right button
Press Press
Tap -1 octave Tap +1 octave
Double-Tap exit tremolo panel Double-Tap run key menu once
frequency
depth

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vibrato>
f set vibrato frequency (0.01 to 20.0)
d set vibrato depth (0.0 to 1.0)
t set fade time (in 1/8ths of sec: 0-255)
~ set legato retriggering
' set staccato retriggering
+ set positive polarity (“fade in”)
- set negative polarity (“fade out”)
. mute
< unmute
! reset
? display vibrato state
ESC or ` exit vibrato panel
(continued ...)

14
vibrato
left button right button
Press Press
Tap -1 octave Tap +1 octave
Double-Tap exit vibrato panel Double-Tap run key menu once
frequency
depth

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effects>
b select bsf effect
l select lpf effect
0 thru 8 select effect by number (0 - bsf; 1 - lpf)
. mute all effects
< unmute all effects
! reset all effects
? list effects
ESC or ` exit effects panel
left button right button
Press Press
Tap Tap
Double-Tap exit effects panel Double-Tap

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bsf> (Binary Shift Filter)
c set number of bits to clip (0-7)
s set number of bits to shift (0-7)
+ normal filter output
- complement filter output
. mute
< unmute
! reset
? display filter state
ESC or ` exit filter panel
(continued ...)

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bsf
left button right button
Press Press
Tap -1 octave Tap +1 octave
Double-Tap exit filter panel Double-Tap run key menu once
shift
clip

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lpf> (Low-Pass Filter)
c set cutoff freq level (parts per 255: 0-255)
. mute
< unmute
! reset
? display filter state
ESC or ` exit filter panel
(continued ...)

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lpf
left button right button
Press Press
Tap -1 octave Tap +1 octave
Double-Tap exit filter panel Double-Tap run key menu once
cutoff

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preset>
0 thru 9 select preset by number (0, 1, 2, 3, 4)
? list presets
ESC or ` abort preset selection
left button right button
Press Press
Tap Tap
Double-Tap abort preset selection Double-Tap