For a free test mix all you have to do is send us your files so we can get started.  Send files in wave format with no processing unless that is the sound you’re after.  To send your files you can use wetransfer or box and dropbox or whichever method you like to use to send multiple WAV files.

Send files to mymix@dahmix.com

You may also want to check out our mix preparation guide as well.