Having multiple lookup paths for ladspa plugins is supported by separating them with ":" in a "path" directive on the pcm definition in asoundrc or the LADSPA_PATH environment variable. But if there is an error encountered while looking for the plugin in one of the earlier paths than later ones won't be checked.

My use case is that I have a mixed architecture system (moving from 32 to 64 bit) and I need applications of both architectures to do sound stuff. Since the dlopen will always fail for one of them it doesn't quite work as-is (I've patched it locally sufficient for my needs).

I think snd_pcm_ladspa_look_for_plugin in src/pcm/pcm_ladspa.c should be changed to not return on errors in the loop but just log a message and proceed.