Cthulhu review
A preset-rich MIDI effect for chord shaping and sequenced arpeggios.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Cthulhu is a MIDI effect plug-in from Xfer Records for producers who want to create, reshape and perform chord progressions from single-note presses. Its chord module combines more than 150 factory presets with MIDI import and chord recording for analysis. A separate pattern-based arpeggiator processes incoming notes or chords, making the product relevant to solo and small-team producers working in compatible DAW hosts on Windows or macOS.
The standout strength is the combination of chord organization and sequencing depth. Chords can be sorted by Circle of Fifths, chromatic order or low note, while the eight-tab step sequencer allows independent tab lengths. Chord-arpeggio mode adds ties, duration and velocity sequencing, and intelligent transpose and harmony functions extend the arrangement options. The published plan shows one paid Cthulhu edition at $39 USD as a one-time purchase; a time-limited demo is also available, with the official page describing a 15-minute limit.
Cthulhu is focused on MIDI performance inside a desktop production setup rather than AI-assisted composition. It does not provide AI features, genre controls or MIDI export, and its value depends on having a compatible DAW host for its VST, AudioUnit or AAX support. Producers seeking preset-led harmony, chord memorization and programmable arpeggios should find the feature set closely aligned with that workflow. Those wanting scale-aware generation, style-directed suggestions or standalone exported MIDI should choose a tool built around those capabilities instead.
Cthulhu pros and cons
- Where it wins
- More than 150 factory chord presets for rapid progression building
- Eight-tab sequencer supports independent lengths, ties, velocity and duration
- Analyzes imported or recorded MIDI and sorts chords multiple ways
- Where it doesn't
- No AI features or genre-specific controls
- No MIDI export function is provided
- Desktop plug-in requires a compatible DAW host
Cthulhu fact sheet, pricing and score →
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