Select 使用 Python Mido 库的 GM MIDI Level 2 乐器

Question

我正在使用 Python Mido 用于创建 MIDI 文件的库。我想出了改变乐器，您将 program_change 消息添加到轨道给定频道：

from mido import Message, MidiFile, MidiTrack
track = MidiTrack()
...
track.append(Message('program_change', program = 36,
                     time = 1234, channel = 0)

这有效，但我只能访问 GM MIDI Level 1 乐器。我想要访问 GM MIDI Level 2 乐器也是。

请用代码告诉我如何做到这一点。所有 MIDI 文档我通过谷歌搜索发现非常混乱。

Answer 1

GM 2 specification 说：

3.2 Program Change Message

[…]
Sets the timbre for the specified Channel.

When the Channel is a Melody Channel, the timbre is selected from the Bank specified by Bank Select (using Bank Select 79H/xxH, with Bank 79H/00H corresponding to the GM1 sound set). […]

3.3.1 Bank Select (cc#0/32)

Bank Select selects the desired Bank for the specified Channel. The first byte listed is the MSB, transmitted on cc#0. The second byte listed is the LSB, transmitted on cc#32. Banks are listed in the GM2 Sound Set table (Appendix A). Bank Select 79H/00H corresponds to the GM1 Sound Set.[…]

The Bank Select message shall not affect any change in sound until a subsequent Program Change message is received.

因此，要访问其他乐器，您必须在发送程序更改消息之前select 不同的库。例如，select "Bubble":

track.append(Message('control_change', control =  0, value = 0x79, channel = 0, time = 1233))
track.append(Message('control_change', control = 32, value = 0x05, channel = 0, time = 1233))
track.append(Message('program_change', program = 0x7a,             channel = 0, time = 1234))

Select 使用 Python Mido 库的 GM MIDI Level 2 乐器

Select GM MIDI Level 2 instruments using the Python Mido library

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midi

midi-instrument

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