ALSA Configuration How To Combine MMAP Emulation and Ladspa Plugin in asound.conf
Try next setting please,it can work under my x86 linux:
pcm.mmap0 { type mmap_emul slave { pcm "hw:0,0" # pcm ladspa }}pcm.ladspa {type ladspa#slave.pcm "plughw:0,0"slave.pcm mmap0path "/usr/lib/ladspa"plugins { 0 { # Limiter label amp input { controls [ 100 ] } }}}pcm.!default{type plugslave { pcm mmap0 #pcm ladspa }}