Audio Synthesis

DiArMaqAr provides real-time audio synthesis capabilities that allow users to audition precise intonational relationships of maqāmāt and their ajnās across different tuning systems, hearing the theoretical data as actual sound.

Overview

Real-time audio synthesis utilizes the Web Audio API through a dedicated SoundContext provider that manages oscillator nodes, envelope control, and MIDI integration. This enables immediate auditory feedback for theoretical concepts, making abstract relationships tangible through sound.

Key Features

Individual Note Playback

• Select any pitch class and hear its precise intonation
• Compare intervals between different notes
• Audition tuning system pitch classes independently of maqām structures

Sequence Synthesis

• Play ascending sequences of maqāmāt or ajnās
• Play descending sequences
• Pattern playback with rhythmic variations
• Demonstrate modal character beyond abstract sequences

Pattern Playback

• Pre-defined melodic patterns (patterns.json)
• Customizable tempo (BPM)
• Rhythmic cells and motifs
• Dynamic control (velocity specifications)

Waveform Support

The audio system supports multiple periodic and aperiodic waveforms:

Periodic Waveforms:

• Sine
• Triangle
• Sawtooth
• Square

Aperiodic Waveforms:

• Multiple custom waveforms (as utilized in Scale Workshop)
• Rich harmonic content options
• Instrument-like timbres

Envelope Control (ADSR)

Precise control over sound articulation:

• Attack: Initial rise time (default: 0.01s)
• Decay: Initial fall time (default: 0.20s)
• Sustain: Sustained level (default: 0.50)
• Release: Final fall time (default: 0.40s)

This allows for:

• Realistic musical articulation
• Expressive control
• Comparison between different tunings with consistent articulation

Tuning System Fidelity

The audio synthesis maintains mathematical precision when rendering tuning systems:

• Non-12-EDO intervals: Accurately rendered without artifacts
• Fractional ratios: Precisely calculated frequencies
• Historical tunings: Authentic intonational relationships
• No quantization: Continuous pitch variation preserved

Real-Time Processing

The implementation ensures:

• Low latency: Suitable for real-time interaction
• Responsive interface: No blocking during audio generation
• Smooth playback: Continuous sequences without gaps
• Performance optimization: Efficient Web Audio API usage

Interactive Features

Keyboard Input

• Computer keyboard mapping to pitch classes
• Real-time response to key presses
• Visual feedback on pitch class bar
• Immediate auditory feedback

MIDI Integration

• External MIDI controller support
• Real-time input processing
• Low-latency response
• Both monophonic and polyphonic capabilities

See the MIDI Integration Guide for detailed MIDI features.

Research Applications

Real-time audio synthesis enables:

Comparative Listening

• Compare same maqām across different tuning systems
• Hear how historical tunings affect modal character
• Understand theoretical differences through direct experience

Educational Use

• Students can hear theoretical concepts
• Immediate feedback on learning materials
• Auditory reinforcement of visual/analytical work

Compositional Exploration

• Composers can audition theoretical possibilities
• Discover new harmonic/melodic relationships
• Explore tuning systems before composition

Technical Implementation

The audio system:

• Uses Web Audio API for browser-based synthesis
• Supports all major browsers (Chrome, Firefox, Safari, Edge)
• Implements graceful degradation for older platforms
• Manages oscillator nodes efficiently
• Handles precise frequency calculations for all intervals

Limitations

Current implementation focuses on:

• Theoretical representation (not performance practice analysis)
• Synthetic waveforms (not sampled instruments)
• Browser-based synthesis (subject to browser audio limitations)

Future enhancements could include:

• Audio analysis capabilities for recorded performances
• Integration with digital audio workstations
• Mobile application support
• Expanded waveform library

Next Steps

• Learn about MIDI Integration for advanced control
• Explore Data Export for external synthesis
• Understand how audio relates to Tuning Systems