MIDI to M4R

Convert MIDI to M4R - online and free - this page also contains information on the MIDI and M4R file extensions.

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File extension .midi
Category Music File
Description The MIDI file was developed to allow both musicians and audio developers to transfer MIDI data from one software application to another. The MIDI file contains messages that specify notation, pitch, velocity and control signals for volume, vibrato, audio panning that synchronise tempo between multiple devices. Historically you would have needed four seperate keyboard instruments, but now with MIDI files you can play multiple instruments from a single controller.
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Technical Details MIDI messages are made up of 8-bit words that are transmitted serially at 31.25 kbaud. A MIDI link can carry sixteen independent channels of information, MIDI messages can be channel messages, which are sent on only one of the 16 channels and can be heard only by devices receiving on that channel, or system messages, which are heard by all devices. There are five types of message: Channel Voice, Channel Mode, System Common, System Real-Time, and System Exclusive. There are two variations of the Standard MIDI File format, called Type 0 and Type 1. Type 0 is a single track of data; Type 1 is multi-track.
Associated programs Audio Evolution
GarageBand
Master Tracks Pro
Sonar
Developed by Various
MIME type audio/midi
audio/x-midi
Useful links List of MIDI Editors and Sequencers
MIDI file information
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File extension .m4r
Category Music File
Description The M4R is an iPhone ringtone file that is essentially a renamed AAC (m4a) file. Not all iTunes Music Store songs can be used to create M4R ringtones. In order to create an M4R ring tone from an iTunes song, the song must allow for M4R ringtone creation. An M4R ring tone is automatically transferred to a user's iPhone when the iPhone is synced with the user's computer.
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Technical Details M4R is essentially a renamed AAC (M4A) file - it is similar to MP3 but compresses the digital audio files further. It is part of the MPEG-4 standard and is specified in the ISO/IEC standard 14496-3. It is a lossy algorithm much like AAC and MP3. M4R supports auditory masking - essentially discarding data with minimal loss of quality.
Associated programs Apple QuickTime Player
Apple iTunes
Developed by Apple
MIME type audio/aac
Useful links Larger guide to M4R
More detail on the MPEG4 format
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