something utterly simple, Format Factory.

fre:ac

cdex

Freemake Audio Converter

http://www.freemake.com/free_audio_converter/

lNomNoml:

 

Freemake Audio Converter

 

http://www.freemake.com/free_audio_converter/

 

This is good, but run something like Malwarebytes when installing, it seems to try and install some "unwanted" cling on's which dont seem to appear if Mwalwarebytes is active.

Audacity has everything that you need and more...!

You would batch process files using 'Chains' which is as the name suggests is a chain of commands (eg. normalize followed by ExportMP3) which can be applied to any amount of files you want.

More info. here: http://manual.audacityteam.org/man/edit_chains.html

Foobar2000 will convert an entire playlist in one go.

xpd:

 

lNomNoml:

 

Freemake Audio Converter

 

http://www.freemake.com/free_audio_converter/

 

 

This is good, but run something like Malwarebytes when installing, it seems to try and install some "unwanted" cling on's which dont seem to appear if Mwalwarebytes is active.

 

All Freemake programmes (that I use) try to install Open Candy silently. This triggers MalwareBytes and Avast warnings and quarantines of Open Candy as a PUP.

Once you get rid of Open Candy the Freemake Video converter and audio converter run great, including when converting a list of files.