Upload-studio.com offers free mastering sample test ( 1 or 2 minutes preview ) to help you choose your mastering engineer.
Simply upload a stereo track (wav or aiff / 24 bits if possible ) I will work on it, and you will get a mastered sample test back as soon as possible, usually a couple of days . Use the uploader on the website to directly send your audio files to upload-studio ! Go to [ upload tracks ] or click the upload button