Plug fails to convert float mono to float stereo, which is required when plug is used for float-only slaves like "jack" or "ladspa".

Steps to reproduce: #~/.asoundrc pcm.!default { type plug slave.pcm { type null } slave.channels 2 slave.format FLOAT_LE } # aplay -f FLOAT_LE /dev/zero

A possible workaround is to use two plugs: pcm.!default { type plug slave.pcm { type plug slave.pcm { type null } slave.channels 2 slave.format FLOAT_LE } slave.format S32_LE }

But shouldn't "plug" do that automatically?

PS: the workaround makes `aplay -fFLOAT_LE /dev/zero` freeze on Ctrl+C, but that's a different alsa 1.0.27 regression that I have not tracked yet.