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OpenMPT

OpenMPT, also known as the Open ModPlug Tracker, is a free and open-source focused on music tracking, allowing users to create, edit, and play back module-based compositions primarily on Microsoft Windows platforms. Originally derived from the ModPlug Tracker, a developed by Olivier Lapicque starting in 1997, OpenMPT evolved into an open-source project maintained by a of contributors, with its first releases emphasizing compatibility with classic module formats while adding modern enhancements. The software's development has been continuous, with the latest stable version, 1.32.05.00, released in November 2025, incorporating bug fixes, improved accessibility, and refinements to playback and editing tools. At its core, OpenMPT supports importing and exporting a broad array of formats, including (.IT), (.XM), 3 (.S3M), (.MOD), and its native MPTM format, alongside compressed variants like MO3 and embedded resources in UMX files. It also handles audio imports such as and , enabling seamless integration of samples and sequences into workflows. For output, users can render tracks to high-quality formats including , , , and , with options for up to quad channels at resolutions of 192 kHz and 32-bit depth via WASAPI or drivers. Key features distinguish OpenMPT in the tracker genre, such as support for VST and DMO plugins for effects and synthesis, a built-in sample editor with and resampling capabilities, and configurable keyboard layouts mimicking classics like or FastTracker 2. The interface includes a multi-document setup with drag-and-drop functionality, a treeview file browser, and up to 128 editable channels (expandable to 256 virtual ones), facilitating complex compositions with multiple sequences, custom tunings, and decimal tempo controls. Advanced tools for live performance, like pattern queuing and MIDI automation of VST parameters, further extend its utility beyond traditional module editing. Complementing the standalone tracker, OpenMPT's playback engine powers libopenmpt, a cross-platform C++ that enables module reproduction in other applications and devices, supporting the same extensive format compatibility without requiring the full . This , with its latest release 0.8.3 on September 6, 2025, underscores OpenMPT's role in preserving and revitalizing the and music heritage through portable, efficient decoding.

History

Origins as ModPlug Tracker

OpenMPT's origins lie in the work of developer Olivier Lapicque, who in the mid- created the Plugin, a designed for web-based playback of files and other tracked music formats. This plugin addressed the growing interest in and module music during the late era, enabling users to stream and play back these files directly in web browsers without dedicated software. The Plugin laid the groundwork for more advanced tools by emphasizing compatibility with classic formats, which became foundational for later features. The software evolved rapidly into ModPlug Tracker, with its first alpha version released on September 19, 1997. This initial release introduced essential editing functions, including copy, cut, and paste operations for patterns, as well as support for (Extended Instrument) files, allowing users to manipulate samples and sequences in a graphical interface tailored for the Windows platform. As a proprietary application developed solely by Lapicque, it quickly gained traction among musicians for its straightforward approach to module composition on PCs. Subsequent updates refined the tool's capabilities while maintaining its Windows focus and status. These updates added features such as input support, drag-and-drop functionality, export, undo/redo capabilities, built-in effects like , export, VST effect plugin support, low-latency audio output, and macros for VST control. Throughout its phase until 2004, ModPlug Tracker remained a Windows-exclusive tool under Lapicque's sole development, prioritizing with Amiga files and adaptation to emerging standards like VST plugins. This emphasis on portability and plugin integration distinguished it from DOS-based trackers, appealing to a new generation of composers transitioning from older platforms. The final release was 1.16 on January 28, 2004.

Transition to Open Source and OpenMPT

In early 2004, following the discontinuation of active development by its original author Olivier Lapicque, the source code for ModPlug Tracker was released to the public as on January 21, 2004. This release, based on version 1.16, was governed by a custom license at first, which permitted community contributions while restricting commercial use without permission. The project, initially hosted on , marked the beginning of collaborative development, building on the tracker's established foundation for Windows-based module editing. By 2009, the licensing transitioned to the more permissive BSD-3-Clause license with the release of version 1.17.02.53 on May 17, 2009, facilitating broader adoption and integration into other projects. The software was renamed Open ModPlug Tracker, or OpenMPT, around 2007 to reflect its open-source nature and ongoing evolution. This period saw the introduction of the experimental MPTM module format in 2007, designed to overcome limitations in legacy formats by supporting advanced features like plugin integration and extended pattern lengths. Key contributors emerged during this time, including Eric Chavanon, who worked on early enhancements from 2004 to 2005, alongside the pivotal involvement of Johannes Schultz (known as Saga Musix), who joined in autumn 2008 and has since led the majority of development efforts. Joerg Hock () joined later in 2012 and has contributed significantly since. OpenMPT's development has progressed through numerous major version milestones, emphasizing , performance, and user workflow improvements. Notable releases include version 1.17.02.53 (May 17, 2009), which added MO3 compressed import; v1.20.01.00 (May 5, 2012), introducing 64-bit support and integration with JBridge for 32-bit compatibility; the v1.23 series (2014), featuring a built-in plugin bridge for VST hosting; v1.26.01.00 (May 21, 2016), with support for 3.6 modules; v1.27.01.00 (September 27, 2017), incorporating SFZ instrument import and full text handling; v1.30.01.00 (December 23, 2021), adding channel color-coding for better visual organization; v1.31.01.00 (April 2023), enabling export and import for formats like 667, , and GT2; v1.32.01.00 (May 2025), which introduced a configurable ; and the latest v1.32.05.00 (November 9, 2025), supporting sample slicing aligned to grid points. These updates have built upon the early VST and support inherited from the ModPlug era, enabling continued advancements in audio processing. As of November 2025, OpenMPT remains actively developed, with ongoing emphasis on enhancing format and accessibility features for modern workflows.

Features

Editing and Composition Tools

OpenMPT features a native Windows graphical user interface that employs a multiple document interface (MDI) for managing multiple module files simultaneously, alongside a tabbed layout for efficient navigation between views such as the pattern editor, sample editor, and instrument editor. Drag-and-drop functionality facilitates the import of samples and instruments directly into the workspace, enhancing workflow efficiency. The software supports two primary editor modes to accommodate different module formats: /XM mode, which allows up to 128 channels with an additional 256 virtual channels for extended , and S3M/IT mode, which provides compatibility with and 3 notations. In the pattern editor, users can create compositions with up to 65,535 patterns and orders per sequence in the native MPTM format, enabling complex arrangements through multiple sequences and precise row-based event entry. The sample editor offers comprehensive tools for audio manipulation, including to amplify samples without clipping, and resampling options such as the Resampler for authentic retro sound reproduction. A visual timeline displays the with draggable points, sustain loops, and cue points, allowing precise adjustments while previewing changes. Slicing functionality enables division of samples at cue points or user-defined intervals, supporting and of formats including , , , AIFF, and 8SVX. In the instrument editor, users can import XI and SFZ files for seamless integration of legacy and sampled instruments, apply custom tunings to samples for microtonal compositions, and utilize decimal tempos for fine-grained tempo swing control. recording and are supported, allowing real-time input and parameter adjustments, while up to 128 channels benefit from enhancements like New Note Actions to manage overlapping notes efficiently. Additional composition aids include the Chord Editor, which defines preset chords for rapid entry via modifier keys; unlimited undo/redo for non-destructive editing; support for multiple sequences within a single file; order range playback locking to isolate sections during preview; pattern timestamp jumps for navigation based on playback time; channel transpose for across tracks; and configurable keyboard layouts emulating or schemes. Accessibility is prioritized through screen reader compatibility and full keyboard-only navigation, making the interface usable without a . VST instruments can be assigned to individual s to expand creative possibilities in compositions.

Playback and Audio Processing

OpenMPT's playback engine employs a modern tempo mode that enables precise BPM control, decoupling tempo from the number of ticks per row to achieve accurate timing suitable for synchronization with external sources. This engine incorporates a built-in OPL3 emulator to faithfully reproduce FM synthesis instruments from legacy formats like S3M and MPTM. For sample playback, it offers multiple resampling algorithms, including linear (2-tap) for minimal processing, cubic (4-tap) for balanced quality, sinc (8-tap) for high fidelity, sinc with low-pass filtering to minimize aliasing, no interpolation for lo-fi effects, and an Amiga resampler that emulates the original hardware's volume and period constraints at 44.1 kHz. A global graphic equalizer processes audio output when enabled, allowing adjustments across frequency bands via sliders, with support for up to four custom presets. Audio output is handled through APIs such as WASAPI (default for low-latency shared mode), WaveOut, for professional low-latency applications, and WaveRT, accommodating sample rates up to 192 kHz, 32-bit depth, and configurations including quad surround. Stereo separation can be adjusted from 0% to 100% to optimize for or speakers. Dry/wet mixing controls allow blending of unprocessed and processed signals, while configurable fade curves manage smooth transitions in volume envelopes. OpenMPT integrates VST effects for real-time processing during playback, enhancing the audio pipeline with external plugins. Rendering features include pattern-specific export to files for quick previews or loops, a tempo tap function to input by rhythmic clicking, and performance optimizations for efficient seeking within large modules. Live performance mode facilitates pattern queuing—where the next pattern can transition immediately or at the end of the current one—and automation for parameter control via external keyboards. Export options cover lossless formats like WAV and FLAC (with adjustable compression levels), lossy MP3 and Opus supporting ID3v2.4 tagging for metadata, and MIDI files that map channels to General MIDI instruments, including drum handling on channel 10. Exports support channel muting or soloing resets and arbitrary transposition via pitch bend for up to 12 semitones on samples. Processing enhancements ensure compatibility with format-specific effects, such as vibrato (4xy in XM, Hxy in IT/MPTM) using selectable waveforms for pitch modulation, and tremor (Txy in XM, Ixy in IT/MPTM) for volume pulsing. XM finetune (E5x) temporarily overrides sample pitch adjustments, while legacy note fade behaviors are preserved through configurable options in IT and MPTM modes. A metronome provides audible clicks for rhythmic guidance during composition and playback.

Plugin and Hardware Integration

OpenMPT integrates with external plugins and hardware to extend its module tracking capabilities, allowing users to incorporate virtual instruments, effects processing, and low-latency audio output into their compositions. VST support for effects and virtual instruments (VSTi) has been a core feature since version 1.12 in 2000, initially supporting up to 8 effects per song. VSTi plugins became assignable to instruments in version 20041012, enabling seamless replacement or augmentation of sample-based sounds. MIDI macros for controlling VST parameters were added in version 1.15, facilitating dynamic automation within patterns. To address compatibility issues between 32-bit and 64-bit architectures, OpenMPT introduced its own plugin bridge in version 1.23.01.00 in 2014, with JBridge support for additional bridging options. As of version 1.32 in May 2025, support for VST shell plugins enables the use of VST 3 plugins via wrappers. DirectX DMO effects are also supported for additional processing options, with an enhanced plugin editor introduced in version 1.23.05.00 for better management of plugin chains and settings. VST plugins gained compatibility with Data Execution Prevention (DEP) in version 1.30.01.00, improving stability on modern Windows systems. Plugin settings are persisted across sessions, and OpenMPT supports loading samples from tools like EZDrummer for quick instrument integration. For hardware integration, output has been available since version 1.15, providing low-latency audio routing essential for real-time monitoring and recording. MIDI hardware is supported through and note-on event binding, aftertouch recording added in version 1.20.01.00, and pitch bend range settings in version 1.20.03.00, allowing precise control from external controllers. Quick Channel Settings, introduced in version 1.20.02.00, streamline hardware and configuration during playback. These features enable OpenMPT to function as a bridge between traditional workflows and contemporary DAW-like environments.

File Formats and Libraries

Supported Import and Export Formats

OpenMPT supports a wide array of import and export formats, enabling users to load legacy module files from various trackers and export compositions in both module and standard audio formats. This compatibility is a key feature, allowing preservation and conversion of music from early digital audio trackers while supporting modern workflows through compressed archives and instrument libraries.

Import Formats

OpenMPT can import core module formats including MOD files from , XM files from , IT files from , and S3M files from Scream Tracker 3, each preserving original pattern, sample, and instrument data with enhancements for playback accuracy. Legacy formats such as MTM from MultiTracker, 669/667 from Composer 669/667, STM from Scream Tracker 2, FAR from Farandole Composer, ULT from UltraTracker, UNI from UNIMOD, and AMF from ASYLUM Music Format are supported in read-only mode to facilitate archival access. Additional import capabilities include compressed archives like MO3, which uses lossy or lossless for efficient sizes, with decoding integrated since version 1.17.02.53 and improved in 1.26.01.00. (.mid/.rmi) can be imported as sequenced note data, supporting and XG standards, though with limitations in tracker-specific effects conversion. are supported for loading sample-based , with compatibility including vendor-specific extensions documented in the . Niche formats added over time expand compatibility further: Symphonie and Digital Symphony modules since version 1.30.01.00, files from version 1.30.01.00, from Tracker in version 1.30.01.00, from ST-Music in version 1.30.01.00, and GT2 from Graoumf Tracker in version 1.31.01.00, 3.6 IFF-style modules in version 1.26.01.00, and 8SVX IFF samples with loop loading fixes in version 1.20.03.00. Archive support encompasses , (with UnRAR 5.6.5 integration in version 1.27.08.00), LHA, GZ, and format-specific compressions like MDZ, S3Z, XMZ, ITZ, MPTMZ, and MDR. Compatibility enhancements include improved loading for XM, S3M, and IT formats with better pattern and effect rendering since version 1.29, sample and name handling refinements in version 1.20.03.00, and full file path support in version 1.27.01.00 to handle international characters without corruption.

Export Formats

For module exports, OpenMPT supports saving to IT (up to 64 channels and 99 samples per ), XM (up to 32 channels and 16 samples per ), S3M, , and its native MPTM format, with OpenMPT-specific extensions stripped during compatibility exports to ensure interoperability. Audio exports include lossless formats like , , and AIFF, as well as lossy options such as (with a compatible mode for legacy players), Ogg , and , configurable for sample rate, , dithering, and metadata tagging. MIDI export has been enhanced in version 1.31.01.00 to generate sequence files with separate tracks per , supporting up to 16 channels and including note velocities, though limited to basic pitch bends within 12 semitones for samples.

MPTM Format

The MPTM format, OpenMPT's native module file format with the .mptm extension, was introduced experimentally in version 1.17.02.46 on May 7, 2007, to address limitations in legacy formats such as the 256-order limit in IT and XM modules. This development merged contributions from the 1.17.3.00a branch, positioning MPTM as an extended IT-based format designed for OpenMPT's evolving feature set, including increased order and pattern limits up to 65,000 entries. Key specifications of MPTM include support for multiple pattern sequences per file, allowing modular song structures; fractional tempos and values for precise timing control; custom modes with per-note ratios and names for instruments; and advanced playback options like swing and global resampling settings. These features enable decimal-based adjustments and user-defined tunings stored in dedicated chunks, surpassing the integer constraints of earlier formats. Additionally, MPTM accommodates chip emulation with instrument envelopes and modulator controls tied to sample filters, alongside VST integration for embedded effects and instruments. In terms of structure, MPTM extends the IT format by appending IFF-like chunks after the standard IT header, using four-byte FOURCC identifiers (e.g., PNAM for pattern names, CNAM for channel names) followed by size-prefixed without . This allows for enhanced representation, arbitrary in notes, customizable fade curves for envelopes, and storage of settings, mappings, and external sample references. Files are identified by the "tpm." magic bytes or version-specific "cwtv" values ranging from 0x0889 to 0x0FFF, ensuring compatibility with IT loaders while adding metadata like cue points for sequence navigation. The format's advantages lie in its suitability for complex, modern compositions, supporting live performance elements such as pattern queuing and multiple sequences for dynamic arrangements, while maintaining through export to IT or formats. It handles over 256 samples per , assignments without external dependencies, and advanced audio processing, making it ideal for non-legacy workflows in OpenMPT. Over time, MPTM has evolved with incremental extensions; for instance, version 1.17.02.48 (r192) introduced 228-specific enhancements like comprehensive custom tuning collections and improved sequence handling. Later updates, such as 1.22.07.01, added support for library names, and version 1.32.00.11 refined mixing modes, further embedding advanced controls like events directly in the file structure. These developments ensure MPTM remains a forward-looking container for OpenMPT's capabilities.

libopenmpt Library

libopenmpt originated as a of the libmodplug library, which was split from the ModPlug Tracker's playback code around 2001 and integrated into multimedia frameworks such as for module decoding. In 2013, it was rebranded and released as libopenmpt to expand support beyond libmodplug's limitations, drawing directly from the OpenMPT project's enhanced player code for broader format compatibility and improved accuracy. The library's core functionality involves decoding and rendering tracker module files—such as , , IT, , and —into raw PCM audio streams, enabling seamless embedding in applications via its stable and APIs. It builds on OpenMPT's format support to provide standalone playback without the full 's editing interface. libopenmpt offers high-precision playback features, including OPL3 emulation for authentic reproduction in compatible modules, configurable resampling algorithms for audio quality optimization, and extraction for details like song titles, artists, and pattern information. These capabilities ensure faithful emulation of original behaviors across various hardware and software environments. It is cross-platform, supporting Windows, Linux, macOS, and Android through compatible builds or wrappers like Wine, with official binaries available for x86, AMD64, ARM, and ARM64 architectures. Development enhancements include 64-bit optimizations introduced in 2014 for better performance with modern plugins and larger modules, and native Windows on ARM support added in 2021 to extend compatibility to emerging hardware. The library is maintained by the OpenMPT development team and aligns its versioning with OpenMPT releases, such as libopenmpt 0.8.3, released on September 6, 2025, corresponding to OpenMPT 1.32.05.00, ensuring synchronized bug fixes and feature parity. In the 0.8 series, support was added for additional formats such as PumaTracker modules and Face The Music files, enhancing preservation efforts. It has been integrated into various media players like Audacious and proposed for , games such as Sonic Robo Blast 2, and development tools for module-based audio handling.

Reception and Usage

Critical Reception

OpenMPT has received positive critical reception for its robust feature set and evolution as a free, open-source , particularly among enthusiasts of module-based music production. In 2007, magazine praised the software's VST support and , listing it among the top five trackers and describing it as a "must-have" tool for module enthusiasts due to its accessibility and power. Reviews from the highlighted OpenMPT's open-source nature, broad format compatibility, and integration of modern audio technologies such as output and VST plugins, which enable low-latency playback and enhanced production workflows. For instance, commentators noted the precision in module playback achieved through its libopenmpt engine, making it suitable for both composition and accurate reproduction of legacy formats like and FastTracker files. Critics have pointed to some limitations, including a steep for users new to tracker interfaces, which can feel unintuitive compared to traditional DAWs. Additionally, its Windows-centric has been criticized for limiting native on systems, though this is often mitigated by running OpenMPT via Wine compatibility layers. Post-2020 updates, particularly the v1.32 series released in 2025, have garnered acclaim for improving through features like DPI awareness, expanded , and enhanced tools such as a project assistant and flexible toolbar, appealing to and retro music communities for their preservation and creative potential. Overall, OpenMPT consistently earns high ratings in software repositories, often 4-5 stars, for its reliability, ongoing development, and successful transition from the original ModPlug Tracker legacy.

Notable Users and Applications

OpenMPT has been employed by prominent video game composers, including Peter Hajba (also known as Skaven) and Alexander Brandon, who used the software to create the soundtracks for the Bejeweled series, such as Bejeweled 3. Their work highlights OpenMPT's utility in producing intricate, module-based compositions for commercial games, with the music originally tracked in the software before mastering. The libopenmpt library, derived from OpenMPT's playback engine, powers module file support in widely used media applications. For instance, supports decoding and playback of tracker formats like , XM, and IT using libmodplug in most builds, while some distributions such as Debian-based systems use libopenmpt for enhanced compatibility. Similarly, incorporates libopenmpt through its openmptdec plugin, allowing -based media tools and applications to handle these formats seamlessly in pipelines for audio processing and streaming. In gaming, libopenmpt facilitates module playback in titles like Sonic Robo Blast 2, where it renders tracker music to support dynamic audio experiences. OpenMPT itself remains a staple in demoscene productions, where artists leverage its pattern-based editing for real-time, hardware-constrained music creation, as reflected in community resources linking to demoscene-focused trackers and radios. Broader adoption includes embedding libopenmpt in open-source projects for cross-platform compatibility. As of 2025, OpenMPT's native support for Windows on ARM enables its use on mobile devices for music sketching and production. This portability has contributed to its role in professional workflows, earning praise for reliability in diverse environments.

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