MATRIXSYNTH: Mutable Instruments Shruthi-1 XT 4-Pole Mission Mono/Duo Synthesizer


Monday, May 04, 2015

Mutable Instruments Shruthi-1 XT 4-Pole Mission Mono/Duo Synthesizer

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Digital oscillators with true ANALOG filters.

Oscillators
band-limited sawtooth with adjustable phase
band-limited square wave with adjustable pulse-width
band-limited triangle wave with adjustable waveshapping
phase-distortion emulation of a low-pass filtered sawtooth (casio CZ-101)
phase-distortion emulation of a low-pass filtered sawtooth with high resonance (casio CZ-101)
phase-distortion emulation of a low-pass filtered sawtooth in the Rocker Launcher’s world in which sine waves are turned into triangles (casio CZ-101)
mysterious phase-distortion thing (could have been in the CZ-101 if the engineers at casio dared…)
phase-distortion emulation of a mouth harp / Morsing (could have been in the casio CZ-101)
stack of 4 detuned sawtooth waves (with aliasing)
simplistic FM (1>2 configuration), with adjustable modulation index and frequency ratio
wavetables, wavetables, wavetables!
sweepable table of basic waveforms
tampura transwave
PPG harsh creature
single cycle waveforms taken from D50 patches
cello transwave
slap bass transwave
organ/drawbars single cycle waveforms
male voice

user wavetable, can be edited by SysEx messages
9 wavetables inspired by the original PPG wave
harsh, aliasing-full waveforms obtained by bit-toggling
sine wave with variable amount of bitcrushing
poor man’s square with pulse-width modulation (plenty of aliasing but fat for basses)
colored noise (sweep from low-pass filtered white noise -> white noise -> high-pass filtered white noise)
lo-fi vowel synthesis (think “speak and spell”) with vowel morphing
Filters
4-Pole Mission: A clean 4-pole based on the high quality SSM2164, from which are derived 15 different filter responses (LP, HP, notch, allpass…) according to a technique popularized on the Oberheim Xpander. Additional circuitry provides 4 different “flavours” of the resonance self-oscillation, from pure and liquid to chaotic and distorted
lp4: 4-pole low-pass.
lp3: 3-pole low-pass.
lp2: 2-pole low-pass.
lp1: 1-pole low-pass.
hp1: 1-pole high-pass.
hp2: 2-pole high-pass.
hp3: 3-pole high-pass.
bp2: 2-pole band-pass.
bp4: 4-pole band-pass.
notch: notch filter.
phaser: phaser.
h2lp: 2-pole high-pass and 1-pole low-pass (band-passlike).
h3lp: 3-pole high-pass and 1-pole low-pass (band-passlike).
n+lp: notch and 1-pole low-pass.
p+lp: allpass and 1-pole low-pass.
The 4 resonance flavors for each filter are:
liquid: standard, close to the CEM or Roland designs (no loudness drop).
ms: Korg-35 style soft limiting is introduced in the signal chain.
wobbly: The 1-pole output is fed back to the filter cutoff frequency for a rubbery chaotic and modulated resonance.
whacky: A combination of the ms and wobbly modes.
Arpeggiator
1-4 octave range
up, down, up&down, random
15 preset rhythmic patterns + 1 programmable rhythmic pattern
warp: creates complex rhythms by cyclical repetitions of steps (eg 1212343456567878 instead of 12345678)
latch/hold
Sequencer
16 steps, with legato/slide, velocity, and modulation
4 modes corresponding to different interactions between the sequence and keyboard play: latch / transpose / loop recorder / override"

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