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Summary of Contents for Instruo traigh
- Page 1 tràigh Discrete Transister Ladder Lowpass Filter User Manual...
- Page 2 Contents Description / Features Installation / Specifications Overview Input/Outputs Filter Frequency Modulation Patch Examples...
- Page 3 Description Nothing quite beats the comforting sound of multiple rich sawtooths softened by a warm, squishy filter. tràigh is a classic transistor ladder low pass filter with a -24dB/octave slope (4 pole). Derived from classic East Coast designs, tràigh is suited for creating fat, warm subtractive voices.
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Page 4: Installation
Installation 1. Confirm that the Eurorack synthesizer system is powered off. 2. Locate 18 HP of space in your Eurorack synthesizer case. 3. Connect the 10 pin side of the IDC power cable to the 2x5 pin header on the back of the module, confirming that the red stripe on the power cable is connected to -12V. - Page 5 tràigh | tra:j | noun (coastal tide) the rising and falling of the sea due to the attraction of the moon, to ebb, recede, settle, empty 1. Inputs 6. Fine 2. Mixer 7. Resonance 3. Output 8. 1V/Oct Input 4. Level Fader 9.
- Page 6 Inputs/Outputs Inputs: There are three audio Input channels that mix the incoming signals before reaching the low pass filter circuit. Mixer: Each Input has a dedicated Level fader. • Input signals will reach approximately unity gain when the corresponding Level fader is set at its centre point. •...
- Page 7 Filter Coarse: Coarse knob controls the cutoff frequency of the low pass filter. • The cutoff frequency is the point at which the filtered signal is reduced by 3dB in amplitude. • Turning the knob anticlockwise will decrease the cutoff frequency. •...
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Page 8: Frequency Modulation
Frequency Modulation 1V/Oct Input: 1V/Oct Input is a bipolar control voltage input for the cutoff frequency. • Exponential CV Input. This can also be thought of as an • tràigh 1V/Oct Input is self-oscillating, the can be used for consistent pitch tracking of the sine waveform, effectively making tràigh a fully functional sine waveform oscillator. -
Page 9: Patch Examples
Patch Examples East Coast Synth Voice Summary: The sequencer or keyboard sends voltages to the oscillator while simultaneously triggering the envelope generator. The CV output of the envelope generator opens tràigh and the VCA, allowing the mixed oscillator signals to pass through. More traditional East Coast patches would incorporate separate envelope generators for tràigh the VCA. - Page 10 Control Path: • Connect the 1V/Oct output of a sequencer or keyboard to a buffered multiple. • A buffered multiple will keep the signal from dropping voltage when split. • Connect four copies of the 1V/Oct CV signal to the 1V/Oct inputs of all three oscillators and the 1V/Oct Input of tràigh.
- Page 11 Sine Waveform Generator Summary: Peaking the resonance of a tràigh forces it to self-oscillate at a pure sine waveform. Once the waveform is generated, it can then be patched through a VCA as a simple synth voice patch. This was often the technique to create sine waveforms in the early days of electronic synthesiser music.
- Page 12 • Set the Level fader to its maximum setting. • Set the level of the VCA to a desired position. • In this patch the Coarse Fine knobs are frequency (pitch) controls. Control Path: • Connect the 1V/Oct output of a sequencer or keyboard to the 1V/Oct Input of tràigh.
- Page 13 Audio Rate Filter Summary: The three oscillators present at the three Inputs tràigh mixed while being modulated by the audio rate signal at the 1V/Oct Input and the Linear FM Input. Self-oscillating Resonance tràigh adds further audio rate modulation. Audio Rate Signal 1V/Oct Signal Audio Rate Signal Output...
- Page 14 Control Path: • 1V/Oct Connect an audio rate signal of a separate oscillator to the Input of tràigh. • Connect another audio rate signal from a second separate oscillator to the Linear FM Input of tràigh. • Turn the Linear FM Attenuator fully clockwise.
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