Comment 18 for bug 183456

you have to change max_buffer_size if you want to load a larger soundfont as default value is 128Mb

http://git.alsa-project.org/?p=alsa-kernel.git;a=blob_plain;f=Documentation/sound/alsa/ALSA-Configuration.txt

  Module snd-emu10k1
  ------------------

    Module for EMU10K1/EMU10k2 based PCI sound cards.
   * Sound Blaster Live!
   * Sound Blaster PCI 512
   * Emu APS (partially supported)
   * Sound Blaster Audigy

    extin - bitmap of available external inputs for FX8010 (see bellow)
    extout - bitmap of available external outputs for FX8010 (see bellow)
    seq_ports - allocated sequencer ports (4 by default)
    max_synth_voices - limit of voices used for wavetable (64 by default)
    max_buffer_size - specifies the maximum size of wavetable/pcm buffers
                       given in MB unit. Default value is 128.
    enable_ir - enable IR