midi | 易学教程

Making Midi Files in Python that are Polyphonic and Different Instruments [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 12 months ago . I'm looking for a midi library in Python that will allow me to create a polyphonic midi file using different instruments. What seems to get recommended here alot is MidiUtil. Although, it seems to have support for polyphony, I can't seem to change the instrument from piano. Can anyone recommend an alternative

Setting instrument channels using the javax.sound.midi package

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问题 I'm having trouble setting the instrument in the javax.sound.midi package. Synthesizer synthesizer = MidiSystem.getSynthesizer(); MidiChannel[] channels = synthesizer.getChannels(); channels[0].programChange(5); System.out.println(channels[0].getProgram()); From the documentation on MidiChannel, calls to channels[0].programChange(int) should change instrument that the MidiChannel is set to and immediately reflected in channels[0].getProgram(). However my program prints "0", indicating nothing

Detect if a MIDI interface is connected in Web MIDI API

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问题 I am experimenting with the Web Midi API in Chrome/OS X. So far I get good results but I am wondering: Is there a way to detect if a MIDI interface is connected/disconnected WHILE an application is running? The way it works for now is to restart the browser to let the application know that an interface is present or not ... There seems to be a MIDIAccess onconnect / ondisconnect event but I don't know what to do to make them fire. Is this implemented yet in Chrome (Canary)? 回答1: The current

Why Does MIDI Offer 127 Notes

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问题 Is the 127 note values in MIDI musically significant (certain number of octaves or something)? or was it set at 127 due to the binary file format, IE for the purposes of computing? 回答1: 127 = 2 7 - 1 It's the maximum positive value of an 8-bit signed integer, and so is a meaningful limit in file formats--it's the highest value you can store in a byte (on most systems) without making it unsigned. 回答2: In the MIDI protocol there are status bytes (think commands, such as note-on or note-off) and

How can I generate musical notes on iOS and play them?

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问题 I am creating a musical app which generate some music. I already used MIDI functions on Mac to create a MIDI file with MIDI events (unfortunately, I don't remember names of those functions). I am looking for a way to create instrumental notes (MIDI's or anything else) programmatically in order to play them. I also would like to have multiple channels playing those notes at the same time. I already tried 'SoundBankPlayer' but apparently, it can't play multiple instruments at the same time.

Actual note duration from MIDI duration

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问题 I'm currently implementing an application to perform some tasks on MIDI files, and my current problem is to output the notes I've read to a LilyPond file. I've merged note_on and note_off events to single notes object with absolute start and absolute duration, but I don't really see how to convert that duration to actual music notation. I've guessed that a duration of 376 is a quarter note in the file I'm reading because I know the song, and obviously 188 is an eighth note, but this certainly

send midi messages from C++

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I'm using a raspberry pi, so it is sort of Debian (Raspbian) I have a synthesizer running (Zynaddsubfx) and I want to send him midi messages from code and have it playing the music for me. I will use ALSA for that. I managed to create a "emitting port" in my program by doing: snd_seq_create_simple_port(seq_handle, "My own sequencer", SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ, SND_SEQ_PORT_TYPE_APPLICATION) now I can see ZynSubAddFX in aconnect -ol and my own sequencer in aconnect -il . And I'm able to connect them: pi@cacharro:~/projects/tests$ aconnect 129:0 128:0 pi@cacharro:~

export midi with sound fonts on iOS

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问题 Is it possible to export a midi sequence with soundfonts assigned to them as a .wav file? If so, can anyone put me in the right direction? I'm currently using MIKMIDI, and I haven't run into any example that does that so far. 回答1: MIKMIDI doesn't include the ability to do this without implementing most of it yourself. That said, it is possible. In essence, you need to create your own Core Audio graph including a MIDI synthesizer unit. Then, in the render callback for the instrument unit, you

No preset found on channel 9 when playing midi with newly created soundfont

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问题 I have created a soundfont with Polyphone to create a new instrument "bagana". It just has 1 instrument "Bagana", with 1 present "Bagana". I tried playing a midi file (just a piano piece) with FluidSynth, it worked. When I direct it through the new soundfront it says: fluidsynth: warning: No preset found on channel 9 [bank=128 prog=0] Is there a problem with the soundfont not being loaded? This is the sf2 file and this and this are the midi files I am trying to play. I am running the midi

How do I read a midi file, change its instrument, and write it back?

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问题 I want to parse an already existing .mid file, change its instrument, from 'acoustic grand piano' to 'violin' for example, and save it back or as another .mid file. From what I saw in the documentation, the instrument gets altered with a program_change or patch_change directive but I cannot find any library that does this in MIDI files that exist already. They all seem to support it only MIDI files created from scratch. 回答1: Use the music21 library (plugging my own system, hope that's okay).