Speak & Glitch GND-1 Manual de usuario

Speak & Glitch GND-1 User manual

(Rev 1.12 October 31, 2022)

Key points

•Faithful emulation of the classic vintage Speak and Spell speech chip

•Digitally circuit bent and capable of so much more than in hardware

•Synthesis: formant / vowel / glottal / speech / rhythm / groove / circuit

bent / glitch / complex oscillator

•Expansive / feature rich / sophisticated / deep architecture allows you to

get inside the speech synthesis chip and explore this highly unique

synthesiser. (This ain't your dad's spelling machine)

•Over 100 real time parameters

•Complete standalone control of all parameters.

•MIDI control of all parameters via USB and/or 5-pin DIN

•Syncs to MIDI Clock with highly unique, individually configurable PPQN

scalers for tempo, drum rate, LFO speed and loop length.

•Powerful Expression Matrix* with all parameters as destinations

•Unique modulation architecture for key parameters and expression

Matrix

•Automation capabilities that enable parameters to drift and mutate

patches, and morph between patches

•Explore circuit bending and controllable chaos like never before

•Extensive randomisation (with undo) possibilities

•Advanced / sophisticated and dynamic MIDI Rhythm generator that

improvises new grooves along with the speech synthesis engine

•Audio rate modulation of amplitude, pitch and filter

•Store up to 1000 presets with seamless preset switching and morphing

•Stereo audio output

•Touch Sensor and rotary encoder assignable to expression matrix

The following pages provide a short guide to using the GND-1 and a summary of commands and

parameters. Further information is provided in the appendices and user manual.

* The GND-1 expression matrix specifies how strongly every GND-1 parameter responds to controllers such as

modwheel, note-on velocity, breath control, aftertouch, and the internal expression LFO, as well as MIDI-note

number, and both the rotary encoder and touch sensor built into the GND-1.

1. GND-1 (Glitch ‘n Drum) Quick start guide

•The GND-1 can be powered from 5V USB power sources using a standard USB-B cable.

After power up the display shows a single preset number describing the bank (100s digit)

and patch number (0—99). In total 1000 user patches can be stored in 10 banks.

FIG. 1 GND-1 Controls and connections

Play/Run briefly press the L (run) button. Press again to stop. Connect an external MIDI

keyboard/controller to activate MIDI notes (on MIDI channel 1 by default).

Select patch hold down the L button and rotate the encoder

Select bank number hold the L button and click the encoder (BANK appears in the display),

rotate the encoder. Click the encoder again with the L button still down, or briefly release the L

button to go back to changing patch number.

Switch to parameter edit mode click the encoder button. All parameter editing requires

only the use of the encoder.

For editing, parameters are divided into three groups labelled Tempo, Pitch, and

Loop Length (see table 1). The group is selected using the 3-way switch.

Edit a parameter scroll to its position within its group, and click the encoder. The display

shows a * before the parameter value. Use the encoder to change the value and click to exit.

Some parameters have double-click extension options (see table 1 and section 3).

Switch back to patch number display (from edit mode) hold down the L button until

the patch number shows.

Randomize parameters use two quick R button presses. Choose drums, loop only, or

synth+loop randomization by setting the switch in the up, middle, or down position,

respectively.

Undo the last randomization hold the L button and use two quick R button presses. This

also resets Auto drift if active.

Revert to last saved values use two quick L button presses

Mute (unmute) the Drum triggers hold the L button and tap the touch sensor. The

display shows “D off” (or “D on”) By default, drums are enabled on power on. Drums remain

muted until toggled back on, even if a new patch is loaded.

Toggle the FLIP function ensure the switch is not in the middle (Freeze) position, hold the

R button and tap the touch sensor. This glitch function flips the data being read from the speech

ROM (see Table 1 and section 2)

Freeze the loop set the 3-way switch to the middle position and hold the R button. The led

turns on, and if in patch-display mode the display shows the freeze indicator. Freeze locks after

holding the button for 2 sec (display reverts to patch number, led stays on). To unlock, apply a

short R press with the switch in the middle position. Note that setting the switch to the middle

position disables the ability to control morphing with the R button.

Set the function of the R button use 3-way switch. When the patch number is on

display, the R button function name is shown underneath it. The mode LED always shows the

current R button function status. The R button functions are:

Switch up: single press* = LOOP A/B mode (A = LED off, B = LED on)

double press = randomize drums

Switch mid: ** while R down = freeze loop (LED on, “[ F ]” on display in patch mode)

Freeze locks after 2 sec (display reverts to patch number, led stays on)

Short press to release

double press* = randomize loop

Switch down: single press* = set Speak mode (LED on=words***, off = random sounds)

double press = randomize loop (or word in Speak mode) + synth parameters

* if morphing, switch up/down single press functions are disabled, and R button controls morphing

** Setting the switch in the mid position precludes using the R button to control morphing

*** To obtain unaffected words and phrases in Speak mode, parameters such as circuit bends and filter

settings should be at 0.

Save a patch press both L and R buttons down for at least one second until both LEDs start

flashing. Release both buttons, and optionally select the patch/bank to save to using the L

button and encoder. Press both buttons again for 1 sec to complete the save, or press either L or

R button to cancel it.

Delete / initialize a patch press L + R + encoder buttons for one second until both LEDs

start flashing. Release all three buttons, and press them again for another second to confirm the

delete, or press L or R button to cancel.

Midi Rhythm generator notes out are sent on MIDI Channel 10 via USB and 5-pin DIN

output. Rhythms are improvised in real time as a result of the interaction between the

synthesizer audio and an expansive set of drum control parameters (see the Tempo list).

Important parameters needed to activate the rhythm generator include Drum trigger sensitivity,

Drum source, Drum rate, and Drum Volume. It is also essential that the MIDI drum notes are

defined in the GND-1’s three drum maps. Drum map selection can be automatically varied using

the drum map sensitivity parameter.

Use the encoder for expression ensure the GND-1 is in patch display mode. By default,

the encoder acts like a modwheel and affects parameters using the modwheel section of the

expression matrix. To change its assignment to breath control or aftertouch, hold down the

encoder button during power-up (when plugging in the USB cable).

Use the touch sensor for expression with the GND-1 in any mode. By default, the

touch sensor affects parameters using the breath control expression matrix. To change it to

modwheel or aftertouch, hold down the L button during power-up.

Use MIDI note number for expression assign MIDI notes to the modwheel, breath

control, or aftertouch expression matrix, hold down the R button during power-up.

Assign a parameter in the expression matrix in edit mode, scroll to the parameter

and hold the encoder button down until the expression dialog appears. Rotate the encoder and

click on one of the five available expression controllers, modwheel, velocity, breath control,

aftertouch, or expression LFO (XP LFO). Dial in the scaling factor that sets the response strength

of the parameter to the controller. Click to finalize, or use a long press to null the scaling factor.

Set the MIDI receive channel hold down both L and R buttons during power-up. A dialog

appears to select the channel using the encoder. Click the encoder to complete selection.

Send GND-1 patches to an external device ensure the GND-1 is in parameter edit

mode and the switch is in the down position. Three quick presses of the right button starts the

Sysex transfer of all patches. To send just the current patch, do the same but with the switch in

the up position. Sysex patch data are sent both via USB and the 5-pin DIN output sockets.

Receive GND-1 patches from an external device no action is needed on the GND-1

to receive single patches or complete Sysex dumps. It automatically responds to valid GND-1

Sysex files sent to it. Sysex data can be received using both USB and 5-pin DIN input sockets.

Configure MIDI thru connectivity hold down all three L + R + encoder buttons during

power-up. A dialog appears to configure MIDI thru between USB and DIN connectors. The six

options include: Off, USB->DIN, DIN->USB, DIN in -> DIN out, DIN in -> USB + DIN out, and All

connections.

AUTO drift parameters hold the L button and briefly press the R. The audio starts if not

already running, the audio LED turns red and the display shows “AUTO”. Repeat to

suspend/continue Auto. Use the Auto depth parameter to limit the extent of the Auto drift. Use

Randomize-undo or adjust AUTO depth to 0 to reinstate undrifted parameters, or Revert to the

last saved ones.

MORPH from one patch to another run the audio for the starting patch. Make sure the

3-way switch is not in the middle (Freeze) position. Hold the R button and turn the encoder to

select the target patch. Release the R button to start the morph. The audio LED turns red. The

display shows approximate morphing progress from > to >>>>. Press the R button to

pause/continue. When complete, the audio Led turns green.

Auto MORPH between multiple patches in a block Make sure the 3-way switch is

not in the middle (Freeze) position. Set the start of the block using patch select. Hold the R

button and briefly press the L. The audio starts if not already running, and the audio LED turns

red. The display shows approximate morphing progress from > to >>>>. Once the new target is

reached, the display shows WAIT time progress (until the next auto morph) from = to ====.

Press the R button to pause/continue at any point in the cycle. Morph time, wait time, number

of patches in a block, and morphing mode can be set using the set morphing parameters

dialogue (see below).

Set morphing parameters Hold the R button and briefly press the encoder. A dialog

appears that lets you scroll between four morph control parameters, MORPH time, WAIT time

(between auto morphs), NUM P the number of patches in an auto-morph block, and MODE. See

section 6 for details. To alter a parameter, click the encoder when scrolling. An * symbol appears

to indicate changes can be made. Value changes apply immediately without having to click to

apply. Pressing L or R retains the value change, or clicking the encoder after changing the value

saves the value as the power up default.

Table 1. Parameter edit mode lists (see section 2 for further details)

TEMPO LIST PITCH LIST LOOP LENG LIST

•Tempo (speech rate)

Pitch

•Loop length

•LFO1 rate

•Pitch mod

•LPleng mod

•LFO2 rate

Pitch mod mix

LP mod mix

•SLFO (slow) LFO rate

Pitch mod1 wav

•LP mod1 wav

Cross mod (LFO1, LFO2, SLFO)

Pitch mod2 wav

•LP mod2 wav

•CLFO (chaos) LFO rate

XPLFO mod mix

•MFO rate

•Tempo clk PPQN

•XPLFO THRESHOLD

MFO fine tune

•LFO1 & 2 clk PPQN

Osc wav

•MFO offset

•Loop Length clk PPQN

Brightness

•Amplitude MFO mod

•Drum rate clk PPQN

Brightness mod

Pitch MFO mod

AUTO rate

Brightness mod mix

Filter MFO mod

AUTO depth

Drive

MFO depth mod

•Drum map

•Fiilter

MFO depth mod mix

Drum map sens

Filter mod

Word Bank select

Drum trigger source

Filter mod mix

•Word select

Drum trigger sens

Filter mod1 wav

•Glitch Bend

•Drum trigger mod

Filter mod2 wav

Glitch Bend mod

Drum trigger mod mix

High Freq Cut

Gravity Bend

•Drum rate

Tune

Gravity Bend mod

•Drum rate mod

Portamento

•Plasma Bend

D rate+pattern mod mix

Pitch Bend Up range

Plasma Bend mod

Drum pattern

Pitch Bend Down range

Flux Bend

Drum pattern mod

Phase Stereo

Flux Bend mod

•Drum randomize

Filter Stereo

Warp Bend

Drum mod1 wav

Bend Stereo

Warp Bend mod

Drum mod2 wav

Bend Stereo mod

Bend mod mix

Drum vel out variation

Attack

Bend mod1 wav

Drums Volume (MIDI)

Hold

Bend mod2 wav

Synth Volume (audio)

Decay

•M (multi) mod depth

Synth Amplitude Env depth

Sustain

M mix

Release

M mod1 wav

Freeze Expression Threshold

M mod2 wav

Extension options are available by double clicking the encoder for any of the dotted

parameters. A full listing of the options is provided in section 3. Key extensions include:

Tempo, LFO1 rate, LFO2 rate, SLFO, and CLFO enable (or disable) envelope triggers at the associated

rate.

Drum map calls up a dialog to change the MIDI drum notes sent out by the Rhythm generator

section

Pitch mod, Drum trigger mod, or Drum rate mod excludes (or includes) the parameter from the

multi-mod depth control (see section 2)

Attack, or Loop length enable envelope triggers or reset the loop for subsequent key-down events if

a key is already down. The Attack extension has an additional option (double click again) that causes

the envelope to be set to 0 rather than starting the attack from the last envelope value.

LP mod1 wav and LP mod2 wav enable loop-sync LFO mode for LFO 1 and LFO2, respectively

2. GND-1 Parameter Glossary

Parameters in table 1 that are not self-explanatory are described here. The modulation terms mod,

mix, and wav are described in section 4.

Tempo (speech rate) refers here to the rate at which the “speech chip” parameters are updated in

the GND-1. For words and phrases, it corresponds to the articulation rate, but more generally it

affects the loop rate, independently of pitch. Note that for very short loops the speech parameters

may not change, and this parameter can have no effect.

MIDI clock PPQN scalers when syncing to MIDI clocks, the GND-1 provides separate PPQN scaling for

Tempo, LFOs, Loop length, and Drum rate. Use each parameter’s extension option (by double

clicking) to enable its scaler. See also appendix II.

SLFO and CLFO are a slow LFO and a chaotic LFO respectively.

The SLFO, LFO 1, and LFO 2 cross modulate each other's speeds using the Cross mod parameter.

XPLFO mod mix mixes pitch mod wav1 and wav2 waveforms (see section 4) to create an automated

expression controller used in the XPLFO section of the Expression Matrix.

Optionally the XPLFO signal can be forced to 0 whenever it falls below the XPLFO threshold value.

Setting the threshold to zero allows the XPLFO signal to remain unmodified. Use the extension

option to set values above threshold to 127.

Drum map sens allows automated switching between the three drum maps in the GND-1. Set this to

0 to use only the drum map selected by the Drum map parameter.

Drum trigger source specifies the balance between “in-chip ” (D src=0) and synth audio output (D

src=127) as trigger source

OSC brightnesss starting with a triangle oscillator when brightness = 0, increasingly cross-fades to

one of the waveshapes selected by OSC wave: Glottal pulse, Saw, Square, PWM, Pitched Noise. Set

to max for standard oscillator waveshape selection.

Drive applies gain / attenuation to the oscillator signal before the filter. Set to 64 for the original

speech ROM energy levels. Note that there is a limiter in the DRIVE processing so if oscillator energy

levels form the speech ROM are already high, applying more DRIVE may not produce large changes.

Filter Because speech already contains inherent resonant filtering, the GND-1 uses a cross filtering

technique to shift and enhance resonant frequencies. Leave the filter at 0 to retain original speech

resonances. Note that this is not a standard LPF/BPF/HPF, but a frequency-translation filter control.

Phase, Filter, and Bend Stereo are used to control the stereo sound stage on the basis of L/R

differences in phase, filter and bend parameters. The bend stereo parameter, when active, can be

modulated using Bend Stereo mod to set the depth of the modulator from the Bend modulator.

MFO is a tuneable Mid Frequency Oscillator that spans from sub-audio to part way into the audio

spectrum. Because it can create audible sidebands around signal harmonics it can provide new

timbres that are not available using typical LFO rates. The MFO can be used to modulate amplitude,

pitch, and filter parameters.

MFO offset offsets the unipolar MFO signal to become bipolar. In amplitude modulation, this

corresponds to going from AM to ring modulation.

Glitch disrupts memory indexing into the speech ROM. It is a high-impact circuit bending parameter

that can turn speech into many different abstract rhythm loops. This control is the equivalent of

having a large number of ‘glitch switches’ in a hardware Speak & Spell. The extension option for this

parameter flips the speech data.

Gravity is another high-impact circuit bending control that ‘binds’ sound clusters and increases

resonances as its strength increases. Beware of extreme settings at high gravity!

Plasma modifies the way Gravity operates and changes the sound clustering, which makes it a great

‘live play’ parameter. By default, sound binding usually increases with increasing Plasma. It can be

made to decrease by setting the extension option.

Flux Usually a somewhat more subtle circuit bending control well suited to loop variations.

Warp A grungy bend that produces a combination of distortion, auto-pitch bending, and often wild

wailing effects depending on the underlying audio being fed into it.

Multi-modulator parameters (M depth, mix, mod1 wav, mod2 wav) specify a (bipolar) offset to be

added to all the LFO modulator blocks simultaneously. Great for quickly creating controlled and fully

reversible changes of lots of parameters at once.

3. Parameter extensions (in edit mode)

•The parameters marked with a dot in Table 1 have extension options. They are switched

on/off by double-clicking on the parameter in edit mode. If an option is active, it is usually

indicated by a letter or symbol next to the parameter value.

Parameter Extension function (display letter)

TEMPO loop start retriggers ADSR {“t”)

LFO1 rate LFO1 retriggers ADSR (“t”)

LFO2rate LFO2 retriggers ADSR {“t”)

SLFO rate SLFO slow LFO retriggers ADSR {“t”)

CLFO rate CLFO chaos LFO retriggers ADSR {“t”)

XPLFO thresh Sets XPLFO CLIP, forcing XPLFO values above threshold to 127 {“c”)

Tempo clock Enables PPQN MIDI clock scaling of Tempo (“+”)

LFO clock Enables PPQN MIDI clock scaling of LFO1 and LFO2 (“+”)

Loop clock Enables PPQN MIDI clock scaling of Loop length (“+”)

Drum clock Enables PPQN MIDI clock scaling of Drum rate (“+”)

D map calls up drum mapping dialog (see next page)

D trig mod Exclude D trig mod from multi mod and Auto drift (“.”);

D rate Quantize Drum Rate modulator (“q”)

D rate mod Exclude D rate mod from multi mod and Auto drift (“.”);

D rand timing Quantize Drum timing randomizer (“q”)

Pitch mod Exlude Pitch mod from multi mod and Auto drift (“.”);

Filter Filter soft-clipping (“s”)

Attack Keyed 2nd note AHDSR retrigger (“k”, “k!”) second option forces attack to 0

LPmod Quantize Loop length modulation (“q”)

LPleng Keyed 2nd note Loop + LFO retrigger (“k”)

LP W1 Sets LFO1 rate to be derived from the loop length rather than free running (“+”)

LP W2 Sets LFO2 rate to be derived from the loop length rather than free running (“+”)

MFO rate MFO rate note sync (“s”)

MFO offset A-mfo turbo mode (“!”)

A mfo Reset MFO phase on 1st key down (“k”)

Word MultiWord mode* produces a different sound on each key (“m”);

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