Simple, high-quality software that never breaks your flow
About Us
What We Do
zelva plans, develops, and delivers software and web applications. In addition to our own products, we also offer consulting on software planning and development for creators and businesses.
Key Products
notave — a browser-based tool for creating clean, professional guitar TAB with minimal effort. Available via monthly subscription (Pro plan).
Development & Technical Management
We translate business requirements into technical specifications and provide end-to-end support from architecture design to project management. We bring deep expertise in desktop application development with C++/Qt/JUCE and audio/media processing software, serving as a playing manager who resolves challenges on both technical and operational fronts.
Contact usProducts
notave is a simple, browser-based tool for creating professional-quality guitar TAB. TAB & standard notation, playback, print, and video export — no heavy software needed.
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ARA Sleuth is a free, open-source debug tool for ARA2 plugin developers. Visualize ARA API call differences across DAWs in real time.
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Reharmonization 101 — Chromatic Progressions with Passing Diminished Chords
A guitarist's guide to reharmonization: keep the melody and the overall skeleton, but swap or insert chords to add motion and color. This article introduces the passing diminished chord as a new tool, and maps it against the techniques we've already covered — secondary dominants, Related IIm7, tritone subs, deceptive cadences, and slash chords — with step-by-step audio examples.
A Guitarist's Guide to ii-V — Breaking Down V7 with Related IIm7
A guitarist's guide to Related IIm7, the most fundamental reharmonization technique in jazz: taking any lone V7 and inserting its matching IIm7 to form a ii-V pair. See how the guide tone line extends on the fretboard, hear the rhythmic drive of ii-V chains, and work through turnarounds, jazz blues, tritone subs, and extended dominants with audio examples.
Secondary Dominants on Guitar: Progressions & Examples
A guitarist's guide to secondary dominants (V7/x): how a temporary V7 before each diatonic chord adds pull and color, with interactive examples in C major.
Tools
Free tools to support music practice and composition
Chord Beat Sequencer
A free browser sequencer that combines a chord progression, a drum pattern, and an auto-bass line. Share your loops by URL.
Guitar Chord Chart
Look up guitar chord fingerings with diagrams. Browse common chord shapes at a glance.
Guitar Scale Chart
Look up guitar scale positions with diagrams. View all 5 CAGED positions for major scales and more.
Circle of Fifths
An interactive circle of fifths & fourths. Explore key relationships, diatonic chords, and build progressions.
Metronome
A free online metronome with adjustable tempo and time signature.