Thanks for your comment. Even though the FS documentation is wrong and
confusing when you consider midi and FSchannels I know you are not going to
change it.
Your argument that these channels are equivalent may be right a simple case
such as your command interface but when you consider an organ they most
definately are not the same or even equivalent. And it is very confusing to
think they are.
The midi inputs for eplayOrgan arrive in midi channels whether from a keyboards
or midi files. There is ONE midi channel for each input. Each midi input is
processed and then sent on to the synth. The notes from EACH incoming midi
channel are fed simultaneously to 32 FSchannels for processing by the synths.
(eplayOrgan actually uses four synths - one for each division).
Also midi channels contain midi events in a specified defined format. The
FSchannels are driven by software procedures in a completely different
specified format.
Thus there is no way that midi channels are equivalent to FSchannels.
Now the good news - Now I have changed the channels from midi channels to
FSchannels, fluid_synth_cc(synth, FSchan, 1,100) now works and produces
tremolo using the sound font Tom successfully tested.
I have learnt quite a bit about sound fonts - especially how their modulation
system works. I hope to learn even more by experimenting now I have a working
system to play with. So thank you all for your help.
Best WishesDavid (csw900)
On Sunday, 5 July 2020, 11:43:27 BST, Tom M. <tom.m...@googlemail.com>
wrote:
There is no such thing as "FSchannels". The documentation of the synth always
talks about "midi channels". The only way you communicate with the synth is
via "midi channels". Just because the number of midi channels is limited to 16
in standard midi files does not mean it's limited in the same way for
fluidsynth. Neither does it mean something is "completely different".
JJC already pointed out how the number of channels can be changed, see
http://www.fluidsynth.org/api/fluidsettings.xml#synth.midi-channels
The naming "midi channels" was given to indicate that channels of a midi file
are semantically equivalent to the channels provided by the synthesizer.
> Just because something works from the command prompt does not necessarily
mean that it will work when another programmer tries to make it work
Since the command prompt uses the same synth API calls as you used in your
app, it is definitely suited as proof of concept.
Tom
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