Instead of setting \imprecise at the end of the loop if a configuration
was found (which clobbered valuable information, see dae2406187), set it
each time a new configuration is chosen.
In the second loop that tries harder, resetting \imprecise also avoids a
previous "imprecise->set(AUDIO, 0)" to last even if another
configuration is chosen later.
Last but not least, it will enable correctly setting the midi input
count hoped for by the configuration.
08f3ef4ecd