Toolset for making music on old hardware with MIDI files.

A compact MIDI parser/writer implementation in PHP for manipulation of MIDI files.

MidiFile:

• Almost complete standalone implementation of MIDI-File-Reader/Writer
• Simple object tree of MIDI tracks for easy manipulation
• Many things are mapped from numbers into a readable form
• Charset support (if set, all text events are converted from this charset to utf-8)
• Very error-forgiving implementation (tries to recover from most cases - log errors only)
• Most MIDI-files are bit-identical after parsing/writing

MidiEditor:

• Automatic manipulation of MIDI files to fit old hardware
• Merge all tracks into one (to make global events like setTempo and deltaTime handling easier/possible)
• Track/Channel selection
• Change instrument
• Change volume
• Transpose high notes down
• Remove short pauses (for fluent playing)

BinaryNoteRenderer:

• Render notes to a binary file for playing them with stepper-motor-player

MidiGenerator:

• Convert notes in form "D5:1/8 D5:1/8 H4:1/8 C5:1/4 A4:1/4" to MIDI files
• Set tempo in bpm
• Set instrument

C program to play a binary notes file (generated by midi-editor) on a stepper motor via GPIO on Raspberry Pi.

Features:

• Automatic direction change
• Tune notes (adjust delay overhead)

Simple Web-Interface for midi-editor and stepper-motor-player