MIDI++ for Roblox

Advanced MIDI Playback for Roblox Pianos

Overview

MIDI++ is a high-performance C++ application designed for playing MIDI files on Roblox pianos with exceptional accuracy and speed. It offers unparalleled precision and advanced features for music enthusiasts and Roblox players.

Key Features

Powerful MIDI Parser: Rapidly processes MIDI files, handling complex structures and corrupted data with ease for reliable playback.
Transpose Engine: Intelligent key detection, genre-specific transposition, and advanced harmonic analysis
Performance Optimization: C++ architecture, high-capacity data handling, nanosecond precision timing
MIDI-to-QWERTY Conversion: Seamless Roblox piano integration with customizable key mappings
Tempo Management: Real-time adjustments with smooth transition handling
Volume Control: Velocity-sensitive playback and dynamic volume modulation
Authenticity Mode: Simulated human-like performance with adjustable realism settings
Extended Functionality: Sustain pedal support, 88-key mode, automatic MIDI file error correction
Advanced Analysis: Chord and rhythm pattern recognition, harmonic structure analysis
System Optimization: Efficient event handling, custom memory pools, lock-free queues, SIMD acceleration using manual vectorization in critical parts of the code to ensure these parts are always optimized.
Customization: Flexible configuration options

Technical Superiority

Utilizes advanced data structures and algorithms for optimal performance
Features custom memory management for reduced overhead
Employs lock-free programming techniques for enhanced concurrency
Optimizied to the max with branch prediction and PGO

Showcase:


Stress Test N°1 7m Notes (Loud)	Transposition Engine Test

Installation

Install Microsoft Visual C++ Redistributable (x64) from here
Download MIDI++ from the Release Page
Extract the package and place MIDI files in the "midi" folder
Launch MIDI++ to begin

System Requirements

Windows 10 or later (64-bit)
AVX2 supported CPU (Generally any CPU that's not older than 2013)
Microsoft Visual C++ Redistributable 2022 (x64)
100MB free disk space

Features Usage Guide:

The following table explains the settings used in the LEGIT_MODE_SETTINGS JSON object:

Setting	Type	Description
ENABLED	Boolean	• Activates/deactivates Authenticity Mode• When true, all other settings become active, and will load the MIDI file in legit mode
TIMING_VARIATION	Float(0.0 to 1.0)	• Introduces timing deviations to each note• 0.1 means ±10% variation in note timing• Example: A note at 1.000s might play between 0.900s and 1.100s
NOTE_SKIP_CHANCE	Float(0.0 to 1.0)	• Sets probability of missing a note• 0.02 means 2% chance to skip any given note• Simulates human errors in fast or complex passages
EXTRA_DELAY_CHANCE	Float(0.0 to 1.0)	• Likelihood of inserting a pause between notes• 0.05 means 5% chance of adding delay after a note• Mimics human hesitation or breaths
EXTRA_DELAY_MIN	Float(seconds)	• Minimum duration for random delays• Should be ≤ EXTRA_DELAY_MAX
EXTRA_DELAY_MAX	Float(seconds)	• Maximum duration for random delays• Defines upper limit for added pauses

Example Configuration

{
  "LEGIT_MODE_SETTINGS": {
    "ENABLED": true,
    "TIMING_VARIATION": 0.1,
    "NOTE_SKIP_CHANCE": 0.02,
    "EXTRA_DELAY_CHANCE": 0.05,
    "EXTRA_DELAY_MIN": 0.05,
    "EXTRA_DELAY_MAX": 0.2
  }
}

Volume Settings

Setting	Value	Description
MIN_VOLUME	10	• Minimum allowed volume level• Represents 10% of maximum volume
MAX_VOLUME	200	• Maximum allowed volume level in your game• Represents 200% of normal volume by default
INITIAL_VOLUME	100	• Starting volume level on initialization• Represents 100% or "normal" volume
VOLUME_STEP	10	• Increment/decrement step for volume adjustments• Each adjustment changes volume by 10 units by default
ADJUSTMENT_INTERVAL_MS	50	• Minimum time between volume adjustments• Prevents changes more frequent than every 50 milliseconds by default

JSON Configuration

{
    "VOLUME_SETTINGS": {
        "MIN_VOLUME": 10,
        "MAX_VOLUME": 200,
        "INITIAL_VOLUME": 100,
        "VOLUME_STEP": 10,
        "ADJUSTMENT_INTERVAL_MS": 50
    }
}