Take mean of channels when converting to mono

3 jobs for master in 1 minute and 22 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
failed build #4274

00:01:22

 
  Test
skipped code_quality #4276
allowed to fail
skipped test #4275
 
Name Stage Failure
failed
build Build
       git.autistici.org/ale/autoradio/cmd/radioctl
git.autistici.org/ale/autoradio/node
git.autistici.org/ale/autoradio/cmd/radiod
git.autistici.org/ale/autoradio/fe
git.autistici.org/ale/autoradio/cmd/redirectord
-----> Discovering process types
Procfile declares types -> web
invalid reference format
ERROR: Job failed: exit code 1