Invoke fluidAllOut in an instrument definition numbered higher than any fluidcontrol instrument definitions. All SoundFonts send their audio output to this one opcode. Send a note with an indefinite duration to this instrument to turn the SoundFonts on for as long as required.
In this implementation, SoundFont effects such as chorus or reverb are used if and only if they are defaults for the preset. There is no means of turning such effects on or off, or of changing their parameters, from Csound.
sr = 44100 kr = 4410 ksmps = 10 nchnls = 2 0dbfs = 32767 ; LOAD SOUNDFONTS fluidload "Piano Steinway Grand Model C (21,738KB).sf2", 1, 1, 1 ; Bright Steinway, program 1, channel 1 fluidload "Piano Steinway Grand Model C (21,738KB).sf2", 2, 3, 1 ; Concert Steinway with reverb, program 2, channel 3 fluidload "63.3mg The Sound Site Album Bank V1.0.SF2", 50, 2, 1 ; General MIDI, program 50, channel 2 ; SEND NOTES TO STEINWAY SOUNDFONT instr 1 ; FluidSynth Steinway Rev ; INITIALIZATION mididefault 60, p3 ; Default duration of 60 -- overridden by score. midinoteonkey p4, p5 ; Channels MIDI input to pfields. ; Use channel assigned in fluidload. ichannel = 3 ikey = p4 ivelocity = p5 istatus = 144 fluidcontrol istatus, ichannel, ikey, ivelocity endin ; COLLECT AUDIO FROM ALL SOUNDFONTS instr 100 ; Fluidsynth output ; INITIALIZATION ; Normalize so iamplitude for p5 of 80 == ampdb(80). iamplitude = ampdb(p5) * (10000.0 / 0.1) ; AUDIO aleft, aright fluidAllOut outs aleft * iamplitude, aright * iamplitude endin