Advertisement
Quick Links
Advertisement
Subscribe to Our Youtube Channel
Related Manuals for Instruo I-o47
Summary of Contents for Instruo I-o47
- Page 1 I-ō47 Multimode Resonator / Filter User Manual...
- Page 2 Contents Description / Features Installation / Specifications Overview Input / Output Frequency Modulation Resonance Patch Examples - East Coast Synth Voice - Sine Wave Generator - Set Phaser To Stun - Kick Drum - Kick Drum 2 - Filter Morph Voice...
- Page 3 Description I-ō47 Multimode Resonator/Filter is a modern take on a vintage circuit design inspired by the classic synthesisers from the early 1970s. Unlike many multimode filters, I-ō47 has a steep -18dB/oct slope with interpolating inputs and tameable resonance. Although inspired by the past, this module was designed with new ideas, new features, and most importantly - new quirks.
- Page 4 Installation 1. Confirm that the Eurorack synthesizer system is powered off. 2. Locate 4 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 I-ō47 | öK-əU-'fɔ:ti-'sEv(ə)n | noun (signal processing) the in’s and out’s of a classic multimode filter/resonator COARSE GAIN FINE 1V/OCT – – MULTIMODE RESONATOR/FILTER 1. Input 1 1. FM Input 2. Limiter Toggle 12. FM Attenuverter 3. Gain 13. 1V/Oct Input 4.
- Page 6 Input & Output Input: Audio input of the filter. • The signal present at the Input will output from all filter types simultaneously. Limiter Toggle: Limiter Toggle sets a fixed level tanh[3] circuit. Limiting is only applied to the signal present at the Input. •...
- Page 7 Band Pass Output: Band pass filter output. • Any harmonics above or below the centre frequency are attenuated. High Pass Output: High pass filter output. • Any harmonics below the cutoff frequency are attenuated. Notch Output: Notch filter output. • Band Stop Filter Band Rejection Filter.
- Page 8 Frequency Modulation Coarse: Coarse knob controls the cutoff frequency of the low pass and high pass filters and the centre frequency of the band pass and notch filters. • The cutoff frequency is the point at which the filtered signal is reduced by 3dB in amplitude.
- Page 9 FM Attenuverter: FM Attenuverter determines the depth of frequency modulation applied to the cutoff/centre frequency. • Turning the knob clockwise will increase the depth of exponential frequency modulation. • Turning the knob anticlockwise will increase the depth of exponential frequency modulation with inverted polarity. •...
- Page 10 • At the outer extremities of the Notch knob the Notch Output will duplicate the Low Pass Output (anti-clockwise) or the High Pass Output (clockwise). Notch CV Input: Notch CV Input is a bipolar control voltage input for the Notch parameter.
- Page 11 Resonance knob determines the level of feedback from the filter’s output to its input. • This is also known as the Resonance, Emphasis, or Feedback. • With resonance introduced, the cutoff frequency of the low pass and high pass filters accentuate while the centre frequency of the band pass and notch filters inversely scales in amplitude.
- Page 12 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 I-ō47 and the VCA, allowing the oscillator signal to pass through. More traditional East Coast patches would incorporate separate envelope generators for I-ō47 the VCA.
- Page 13 • Set the knob to a desired position. • Set the level of the VCA to a desired position. 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.
- Page 14 Sine Wave Generator: Summary: With feedback enabled, peaking the resonance of I-ō47 forces it to self-oscillate as 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 15 Control Path: • Connect the 1V/Oct output of a sequencer or keyboard to the 1V/Oct Input of I-ō47. • Connect the gate output of the sequencer or keyboard to the trigger input of an envelope generator. • Connect the envelope generator CV output to the CV input of the VCA and set the corresponding CV attenuator to a desired position.
- Page 16 Set Phaser To Stun: Summary: One bipolar LFO modulates the cutoff frequency of the low pass filter while a second bipolar LFO modulates the centre frequency of the notch filter. A gate or trigger signal can be used to reset the cycle of the LFOs.
- Page 17 • Set the fundamental frequency of the oscillator to a desired position. • Set the Gain fader to its maximum setting. • Set the Coarse Fine knobs to desired positions. • Set the knob to a desired position. • Set the Notch knob to 1, its centre position.
- Page 18 Kick Drum: Summary: A gate or trigger signal triggers cèis.The attack gate output of cèis pings the resonance of I-ō47 via the Strike Input. The CV output of cèis modulates the cutoff frequency of I-ō47. Output Gate Signal Audio Path: •...
- Page 19 Control Path: • Connect a gate or trigger signal source to the gate/trig input of cèis. • Connect the attack gate output of cèis to the Strike Input. • Connect the CV output of cèis to the FM Input and set the Attenuverter just to the right of its centre position.
- Page 20 Kick Drum 2: Summary: A gate or trigger signal source triggers cèis.The attack gate output of cèis pings the resonance of I-ō47 via the Strike Input. The CV output of cèis modulates the cutoff frequency of I-ō47. An inverted copy of the CV output of ceis decreases the amount of resonance of I-ō47, crossfading between the oscillator and silence.
- Page 21 • Set the knob to its maximum position. This allows for the monitoring of the Inverting Input. • For a more aggressive kick drum sound, enable feedback by setting Feedback Toggle to its up position and connect the Low Pass Output I-ō47 to the input of tanh[3].
- Page 22 Filter Morph Voice: Summary: The fold and PWM outputs of Tš-L are mixed/interpolated via Input Inverted Input I-ō47 Band and then sent to vincâ via the Pass Output. A sawtooth waveform LFO modulates I-ō47 while a sub square waveform from Cš-L pings the resonance of I-ō47. The sequencer sends voltages to the 1V/OCT of the I-ō47 while simultaneously...
- Page 23 • Connect the Band Pass Output to the input 2 of vincâ and set the amplitude/CV attenuator of vincâ to a desired position. • Monitor the output of vincâ. • Set the fundamental frequency of Tš-L to a desired position. •...
Need help?
Do you have a question about the I-o47 and is the answer not in the manual?
Questions and answers