Instruō - ceithir overview

video upload by Instruō

• Quad stereo mixing VCA Morphable filter modes
• Stereo enhancement
• Internal LFO modulation
• Optimised Oscillator mode
• Pingable resonance
• Multiple limiter types

The culmination of years of filter experimentation at Instruō, ceithir is a quad state-variable filter and resonator system that expands upon the sonic architecture first introduced in the I-ō47. Each of its four analogue filter cores can operate independently as a traditional state-variable filter, a resonant sine waveform oscillator, or a precision pitch-trackable resonator, offering low pass, band pass, high pass, notch, and morphable responses alongside extensive CV control. Integrated waveshaping and soft-limiting circuits allow ceithir to move effortlessly from subtle harmonic enhancement to aggressive resonant saturation, while dedicated strike inputs transform each filter into a playable percussive voice.

Far beyond a conventional filter bank, ceithir is designed as an animated stereo sound environment. Advanced Morph and Width controls generate immersive spatial movement through phase manipulation by all-pass filtering, while four internally routed trianglewave LFOs create evolving modulation networks capable of continuously reshaping frequency, resonance, stereo enhancement, and timbre. With parameter linking, global frequency control, and integrated master stereo routing options, ceithir delivers the unmistakably musical character of Instruō filters on an entirely new scale."

"This video is a more typical module overview in my long form style (It's easier to make a long video than it is a short one!).
ceithir is a BIG module! And is not necessarily the most practical addition to all systems... But if you like it's features and tone, a more practical option is the ceithir's older/smaller sibling: the I-ō47 (which is also featured in this video).

I hope you enjoy this module, or it's design video series, or both!
The fact that there is support and enthusiasm for this scale of ridiculous design project is something I cannot thank you all enough for."

00:00:00 Instruōduction
00:02:50 single filter fōcus
00:04:17 INPUT
00:06:33 Q
00:09:06 INVERTING INPUT
00:10:59 MULTI-MODE OUTPUTS
00:13:08 CV INPUTS
00:16:57 MORPH
00:19:14 OUTPUT (LIMITER)
00:22:33 STEREO OUT
00:23:57 LFO

00:26:19 I-ō47 mini-video feature

00:29:52 ceithir global features
00:31:44 INPUT NORMALLING
00:32:56 MEGA STEREO
00:33:53 TRUE STEREO
00:34:46 GLOBAL 1V/OCT
00:36:54 TRUE STEREO SUMMING CONFIGURATION
00:38:53 ARM PHASERS
00:41:40 MASTER LIMITER
00:44:32 MODULATION BUS
00:45:46 MODULATION BUS - FM
00:48:52 MODULATION BUS - ANIMATE

00:53:26 Resonator Mode
00:56:46 RESONATING COMPLEX AUDIO
01:02:46 QUADRATURE SINE WAVES
01:06:09 STRIKE INPUT (KICKS)

01:18:24 Oscillator Mode
01:20:42 4-QUADRANT / RING MODULATION
01:21:37 AMPLITUDE STABILISATION
01:23:58 QUASSILLATOR (QUAD-OSCILLATOR)

01:26:29 Parameter Link
01:28:59 STEREO TWIN PEAK