Hello.
I'm toying around with adding a MIDI interface to OpenAL Soft, allowing
applications to specify timestamped MIDI events for sample-perfect
timing. I'm using FluidSynth to render the MIDI into my output buffer to
get mixed in with all the other sounds. In general, it's all working
splendidly.
In the interest of standardization, I'm forcing the synth to use "mma"
bank select mode, which as far as I understand, conforms to General MIDI
Level 2 <https://en.wikipedia.org/wiki/General_MIDI_Level_2>. I do this
by setting
fluid_settings_setstr(self->Settings, "synth.midi-bank-select", "mma");
before calling
self->Synth = new_fluid_synth(self->Settings);
When I do this, I find I'm not able to change the bank used by channel 9
(0-based counting). According to the above wikipedia entry, it's
supposed to be possible to use all 16 channels for melodic instruments,
however when I try to change channel 9 to bank 0 via CC0 and CC32
messages (followed immediately by an appropriate program change),
FluidSynth continues using bank 128 on channel 9.
Also, I'm confused about what exactly I'm supposed to specify to change
the bank. According to FluidSynth's wiki,
<http://sourceforge.net/apps/trac/fluidsynth/wiki/FluidSettings>, 'mma'
selects a bank according to the math:
CC0*128 + CC32
However, according to the GM2 wikipedia page, "General MIDI 2 compatible
synthesizers access all of the 256 instruments by setting cc#0 (Bank
Select MSB) to 121 and using cc#32 (Bank Select LSB) to select the
variation bank before a Program Change. Variation bank 0 contains full
GM sound set." which says that to set an instrument from melodic bank 0,
you set CC0 to 121 and CC32 to 0, followed by a program change for the
wanted instrument.
Additionally, selecting a drum bank is done by setting CC0 to 120 and
CC32 to 0, then a program change for the wanted drum kit. This doesn't
at all follow the math detailed above.
In any case, I've tried setting CC0=0 + CC32=0 and CC0=121 + CC32=0, and
both result in FluidSynth continuing to use bank 128 on channel 9.
Am I doing something wrong, or misunderstanding something? Thanks for
any help you can provide.
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