Audio to MIDI - Wave-to-Midi Converter

AKoff Music Composer Version 2.0
Buy now ($29) Free download

This software is designed for recognition of polyphonic music from audio source and its conversion to MIDI score. Now one can compose music without MIDI keyboard and even without knowlege of notes or how to play musical instruments. It is as easy as humming a tune into a microphone and Composer will do the rest. Composer will take into consideration individual performance style tracking note dynamics and pitch bends.

Recognition features: Polyphonic music recognition from pre-recorded WAVE files or directly from audio input of your sound card in real-time. Tracking note dynamics and pitch bends. Using different harmonic models to improve recognition of appropriate instruments. Higher harmonics filtering. Restriction of recognized pitch range. Manual or automatic noise sensitivity control.

Playback features:

PCM WAVE files playing.
Standard MIDI files playing.
Muting and Soloing MIDI Tracks.
Changing MIDI track name, instrument, volume and pan.
MIDI track deleting.
New MIDI file settings (Tempo and Timebase).
Sync WAVE and MIDI playback.

How It Works

Main Window

Composer analyzes a stream of audio signals from pre-recorded WAVE files or directly from audio input of your sound card in real-time. It can be sound from microphone, linear input or audio CD.

Composer normally recognizes polyphonic music with one instrument or voice. This means you won't get the appropriate results if you try to recognize many instruments playing at the same time especially with drums. Composer determines note dynamics and frequencies and translates this information into MIDI events. Composer doesn't automatically recognize the types of sounding instruments. Moreover, human voice and instruments have various timbres and complicated harmonic components, therefore recognition accuracy depends on concrete instrument or singing style. Also the recognition is influenced by quality of WAVE recordings such as background noises and recording level.

The complicated mathematical algorithms of DSP (Digital Signal Processing) require a great amount of calculations and consequently a fast computer. When recognizing audio input in real-time, Composer only works reliably on Pentium 150 and higher processors. On weaker machines, the incorrect working or dead halt of the program may occure, which is removed through pressing Ctrl-Alt-Del keys.

During recognition the recorded notes are automatically shown on the graphic keyboard. After recognition is stopped, you can play and adjust the obtained melody. You can select the playback MIDI instrument, change octave and also try to correct music scale or use Pitch Bend Control. Further you can add the recorded track to the general list of MIDI tracks and then save the generated MIDI file. The last feature is accessible only in the registered version.

If some notes are recognized incorrectly, you can open the saved file in any MIDI editor and manually correct your score. If you have MIDI keyboard, it will be easier to play with keyboard entering results into MIDI editor. But if you aren't a musician, Composer will help you to record your own melody in a popular MIDI format using only your voice or your non-MIDI instrument.

Free download

Wave to Midi Samples

You can download and listen to source wave-files and recognized midi-results. Wave recording format is PCM 11025 Hz, 8-bits, mono.
guitar.wav (43117 bytes, 3.9 seconds) converted to guitar.mid (320 bytes)
piano.wav (35664 bytes, 3.2 seconds) converted to piano.mid (259 bytes)
voice.wav (44122 bytes, 3.9 seconds) converted to voice.mid (298 bytes)
whistle.wav (39534 bytes, 3.5 seconds) converted to whistle.mid (239 bytes)

Download and try for free

The unregistered version of our software allows you to evaluate the program features before registering it. If you decide to continue using our software after evaluation, you must register it.

Main Window

AKoff Guitar Assistant
Buy now ($19) Free Download (this version is fully functional)

AKoff Guitar Assistant is designed to assist in visual tuning a guitar with microphone or an electrical guitar connected to PC’s sound card. It analyzes in real time a stream of audio signals from Wave input of your sound card and calculates the main frequency. This frequency is shown by a pointer on graphic guitar signature stamp (frets), comparing it to the proper frequency. Tuning a string now simply means centering the pointer on the appropriate graphic fret.

AKoff Guitar Assistant recognizes monophonic sound. This means you won't get the appropriated results if you try to play chords. The recognition is influenced by quality of your sound card and microphone.

The complicated mathematical algorithms of the analysis of digital signals require a great amount of calculations and consequently a fast computer. AKoff Guitar Assistant only works reliably on Pentium 133 and higher processors. On weaker machines the incorrect working or dead halt of the program may occure which is removed through pressing Ctrl-Alt-Del keys.

What is Music Recognition?

In a few words music recognition is mathematical analysis of an audio signal (usually in WAVE format) and its conversion into musical notation (usually in MIDI format). This is a very hard artificial intelligence problem. For comparison, the problem of recognition of scanned text (OCR - Optical Character Recognition) is solved with 95% accuracy - it is an average exactitude of recognition of the programs of the given class. The programs of speech recognition already work with 70-80% accuracy, whereas the systems of music recognition work with 60-70% accuracy but only for a single voice melody (one note at a time). For polyphonic music the accuracy is even lower.

To create a MIDI file for a song recorded in WAVE format a musician must determine pitch, velocity and duration of each note being played and record these parameters into a sequence of MIDI events. A music recognition software must do the same things. Even for a single instrument song it is not a simple task, because a WAVE recording contains waveform signals and doesn't contain any music specific data.

In general cases the variety of music timbres, harmonic constructions and transitions make it impossible to create a mathematical algorithm for precise reconstruction of a music score from the audio sources. It is hard to recognize audio data which contains many instruments, drums and percussions or clipping signals, unstable pitch sounds and background noises. However, in many cases AKoff Music Composer will produce a MIDI material that represents the basic melody and chords of recognized music. You can download and listen to source wave-files and recognized midi-results.

WAVE and MIDI Formats

The difference between WAVE and MIDI formats consists in representation of sound and music. WAVE format is digital recording of any sound (including speech) and MIDI format is principally sequence of notes (or MIDI events). The relations are approximately the same as between sounded speech and printed text.

WAVE format
A WAVE file is the recording of a sound wave. It is the mix of all the given sounds (instruments, voices, background noises) you could have heard at the moment of recording. So you can record, for example, human voice in WAVE format, but you cannot edit any note or change any instrument in music recorded in a WAVE file. The Standard Windows PCM WAVE format contains only Pulse Code Modulation data without compression. PCM format is the only kind that saves the entire wave completely with no data loss.

There are many other formats for audio recording. They differ from each other by compression algorithms and can be referred to one group. The conversion from one format into another is very simple. There are many sound editors which allow one to do this.

The following is a list of some audio formats with file extensions: Standard Windows PCM waveform (.WAV) Microsoft ADPCM waveform (.WAV) MPEG Layer (.MP2, .MP3) RealAudio (.RA) Sound Blaster voice file format (.VOC) Apple AIFF format (.AIF, .SND) WMA, VQF and many others.

MIDI format
MIDI (Musical Instrument Digital Interface) format is a sequence of commands to control one or more pieces of musical hardware or software such as synthesizers or sequencers. These commands are not sounds, they are instructions to do something (mostly to generate sound). For example: select Instrument #1 (Acoustic Grand Piano), play Note #60 (C5) with Velocity #127. So you cannot represent, for example, human speech in MIDI format, but you can edit any note or change any instrument in music recorded in MIDI file.

MIDI to WAVE conversion
Music recorded in MIDI format can be easily transformed to WAVE format. You can play MIDI files on an appropriate player and record reproduced music in a sound editor. The size of a WAVE file will be larger than the same music file represented in MIDI format. The quality of music will be determined by MIDI capabilities of your sound card and professionalism of the musician creating the source MIDI file. There are programs converting MIDI files into WAVE using only their own timbres of MIDI instruments (WAVE-table synthesis).

The reconversion from WAVE to MIDI is the music recognition problem which up until now has no qualitative solution (with 100% accuracy).

MIDI2Audio / MIDI2Wave / MIDI2MP3 / MIDI Conversion

Two of the most common questions about MIDI conversion are 'How can I convert MIDI to MP3?' and 'Can I make a music CD from MIDI files?' Both are possible, but the MIDI files must first be converted to WAV files. The resulting WAV files can then be burned to an audio CD using any CD recording program, or converted to MP3 files.

Midi2Wave Recorder
Buy now ($24.95) Free download

Midi2Wav Recorder is a software for Windows that enables you to convert MIDI to WAV, MIDI to MP3 and MIDI to WMA files. The conversion is as easy as one touch of a button. With Midi2Wav Recorder you can: Midi2Wav Recorder - midi to wav, midi to mp3 converter - Screenshots and Features

Convert MIDI to WAV, MP3, WMA
Rearrange instruments and tracks
Change tempo and duration
Control record quality
Use batch conversion

Key Benefits

You have brilliant opportunity to create an album of your favorite MIDI compositions performed in any tempo. If you want to record a song accompanied by a MIDI music then it is possible to do this as well. You may record only solo parts without arrangement and many other variants. These opportunities are often used by the music teachers creating teaching books on CD for their students.

Midi2Wav Recorder gives an option to control overall level and clipping of recording while the built-in mixer lets changing volume to the desired level.

The batch mode is useful for creating musical collections on audio CD. Midi2Wav Recorder looks at total duration of the chosen MIDI files and total size of the files to be converted. This allows for accurate estimating whether they will fit on one CD.

With the help of Midi2Wav Recorder you can also convert any WAV file into MP3/WMA file by using different quality of compression with any accessible bitrates you may prefer.

Midi2Wav Recorder has now been eight years in the making and we have thousands of happy customers. If you still are unsure that it will do what you want - then why not download the free Demo version and try it out?

Features and Screenshots

Main Window:

Converting MIDI files to WAV, MP3 and WMA files using different qualities and bitrates
Changing the tempo by multiplying it by a specified ratio
Recording your singing into microphone with MIDI playback accompaniment
Visual representation of waveform and sound level
Evaluations of average and maximum volumes, clipping warnings
Built-in mixer provides the possibility to maximize the dynamic range of recording by adjusting record and MIDI playback level

Main Window - Midi2Wav Recorder - midi to wav, midi to mp3 converter