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Speak & Glitch GND-1 User Manual

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Speak & Glitch GND-1 User manual
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.
(Rev 1.12 October 31, 2022)
1

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Summary of Contents for Speak & Glitch GND-1

  • Page 1 • 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.
  • Page 2 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.
  • Page 3 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.
  • Page 4 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.
  • Page 5 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.
  • Page 6 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.

  • Page 7: Extension Options

    Table 1. Parameter edit mode lists (see section 2 for further details) TEMPO LIST PITCH LIST LOOP LENG LIST • • Pitch Tempo (speech rate) Loop length • • • LFO1 rate Pitch mod LPleng mod • Pitch mod mix LP mod mix LFO2 rate •...
  • Page 8 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.
  • Page 9 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.
  • Page 10 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...
  • Page 11 The first drum sound name (Kick) and its MIDI output note appear. If the note number matches the GND-1 default an * symbol is shown to the right. Optionally scroll to choose a different drum in the list, and click to allow note changes. Adjust the note number, and click again to save the change, or press the L button to cancel.
  • Page 12 4. GND-1 LFO modulation architecture The LFO modulation architecture employed throughout the GND-1 is shown in Fig. 2. The inputs to all modulation blocks include the system wide rates LFO1 and LFO2, slow SLFO, chaotic CLFO, and the AHDSR (envelope) signal.
  • Page 13 Multi-mod parameters simultaneously apply an offset to the modulation depth, mix and waveshapes W1 and W2 (see section 4) of the modulation blocks in the GND-1. They are saved and recalled along with a patch as separate parameters from the individual modulators, and therefore fully reversible at later times.
  • Page 14 The GND-1 contains a powerful morphing engine that allows all current parameters to evolve over time towards the values of another patch in the GND-1. To use the morph controls, ensure the 3- way switch is not in the middle (Freeze) position.
  • Page 15 Pause is activated automatically to avoid the patch changing during the save procedure. Upon completion of the save the GND-1 does not switch to the saved patch as it does in normal save operations. Instead, it returns to the originating patch, remaining in pause. Release the pause to continue morphing towards the previous target.

  • Page 16: Appendix I: Summary Of Button Functions

    Appendix I: Summary of button functions (A) Global functions (patch display + parameter edit mode) LEFT BUTTON: short press* Run (audio LED on) / Stop 2x short press Revert to saved patch Hold during Powerup Assign touch sensor to expression controller RIGHT BUTTON: Single short press: Mode change: if patch showing, function is shown in display...
  • Page 17 3x Short press SysEx Dump: Sends the current patch if the switch is up, or all patches if the switch is down ** The GND-1 must be in parameter edit mode ** ENCODER BUTTON: Short press Toggle between list scrolling and parameter editing...
  • Page 18 Appendix II: GND-1 MIDI CC reference CC Function Range Comments Bank select Breath control 0-127 Plasma 0-127 Modifies the effect of Gravity AUTO depth 0-127 Portamento 0-127 NRPN data MSB Channel Volume 0-127 Amplitude ADSR depth 0-127 Expression param select...
  • Page 19 Pitch mod depth 0-127 Additive Pitch mod mix 0-127 Pitch mod wav1 0-16 See Table 2 Pitch mod wav2 0-16 See Table 2 NRPN DATA LSB Additive Plasma bend mod depth 0-127 Filter 0-127 Filter mod depth 0-127 Additive with folding Filter mod mix 0-127 Filter mod wav1...
  • Page 20 Drum trig sens mod mix 0-127 Drum rate 0-127 Drum rate mod 0-127 Additive Drum pattern 0-127 Drum pattern mod 0-127 Additive with folding Drum rate+pat mod mix 0-127 Drum mod wav1 0-16 See Table 2 Drum mod wav2 0-16 See Table 2 Drum timing random 0-127...
  • Page 21 2 = key restart Loop off 3 = key restart Loop on 4 = key restart AHDSR off 5 = key restart Attack from last val 6 = key restart Attack from 0 Xpression Freeze Thresh 0-127 High Freq Cut 0-127 0 = max HF cut, 127 = no HF cut, NRPN param low byte...
  • Page 22 CLFO 1 CC OUTPUT CC 119 AHDSR OUTPUT * CC 121 “Initialize” reset state Issuing the initialize command sets most GND-1 parameters to 0, with the following exceptions: Tempo (CC 19) = 82 S Vol = 127 Pitch (CC 33) = 80...
  • Page 23 Table 2. GND-1 waveshape select values for oscillator and modulation blocks Voiced Oscillator waveform values Vocal glottal pulse (from Speak & Spell) Square Pitched Noise Modulator waveform values Triangle Square Pulse 25% low Pulse 25% high Falling Exponential Rising Exponential...
  • Page 24 CC 98=0, CC6=1 CC 98=1, CC6=4 CC 98=2, CC6=1 (save rather than delete) On power up, the GND-1 initializes CC 99 to 0, so setting CC 99 to 0 can often be omitted unless it has been changed via external control.
  • Page 25 Table 3. GND-1 NRPN functions listing function CC 6 data CC 38 data Bank number (for delete or save) Patch number (for 0-99 delete or save) Save/ delete 0=delete, else save specified patch Save/delete current 0=delete, else save active patch Apply / null multi 0=null.
  • Page 26 1=random 2=sequential no drum morphs or randomization 3=random no drum morphs or randomization Morph control 0 = normal prog changes (default) 1= morphed prog changes 2=stop Auto morphing 3=start Auto morphing 4= Pause morph 5= Pause off (default) 6=inhibit PPQN morph 7=allow PPQN morph (default) Drum mute...
  • Page 27 Acknowledgements Having spent many years circuit bending hardware Speak and Spell games, the idea for the GND-01 arose from my desire for more extensive control over the unique sounds produced by the speech synthesis chip in those games. This was made possible by using an accurate software emulation of the chip’s workings as well as speech data in those games.