Description of using synthesizer without audio driver is not obvious or not full.
It is diffucult to understand how to handle audio stream from synth using fluid_synth_write_s16() method.
I suppose that i can use callback function fluid_audio_callback_t (typedef in synth.h) for handling any output sound of synthesizer(noteon events, midi
playing etc).
But again not obvious how set it callback function for handling output pcm data.
Could you give me some more information about using synthesizer without audio driver ?