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Over the Kit

A common practice for developing drumkit chops is to take a sticking pattern and orchestrate it "over the kit". For example, the sticking pattern RLK (which translates to right hand, left hand, kick drum) can be played over a 16th notes as RLK-RLK-RLK-RLK-RLRL (the last 4 notes being "padding"). This web app allows the drummer to take a sticking pattern and generate and hear different orchestrations, in different contexts.

Over the Kit GIF

Tech

The key technologies and libraries used:

  • vanilla javascript
  • vexflow
  • Web Audio

As I've worked mostly with React, I honestly wasn't sure which parts of the ES6 syntax were safe to use, so ended up trying to avoid most of them (especially imports, which leads to the terrible use of the terrible, liberal use of external <script>s).

The code is pretty OO-influenced, with a "pipeline" that generates the scores and lines up audio via:

  • StickingPadder, which "pads" missing notes when trying to fill the sticking for each bar
  • Orchestrator, which takes a sticking and orchestrates it
  • GrooveGenerator, which prepends a groove to the orchestrated sticking

It's all pretty messy still, I made some early stabs at separating out domain models (e.g. Score, Notes) but still am not super happy with it...

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Drum-kit sticking orchestration, using Vexflow and WebAudio

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