Professional online mixing is the last step in the music production process. Using audio mixing & mastering services is an easy way for artists and recordables to have their songs and albums professionally mixed online. First a song is composed, then recorded in the recording studio by an engineer. Afterwards songs are mixed using high end audio equipment. This is done using expert eq and compression techniques as well as the right balances of each instrument. In order to receive the best results you should always use a profession studio instead of landr mastering or similar instant online mastering providers. Only experienced audio engineers using special audio mastering techniques can bring your tracks to the next level. This is even more important if you are planning to release your project on cd or vinyl. Only a mastering engineer can enhance and prepare your songs so they can be pressed on those audio formats. Otherwise your tracks might not be accepted by the duplication company and will be rejected by their quality control. You will need to provide a DDP file which is properly authored so no errors will occur. Vinyl requires even more, so music can be pressed. The length of each vinyl side needs to be calculated and depends on the used instruments of each song. Bass heavy songs take away more space on the lacquer then tracks without. With audio mastering online you can get your songs professionally mastered by experienced engineers around the world. How much does audio mastering cost? A professional studio charges between $40 to $200 per song for mastering. However the online mixing and mastering prices can vary. Everything less is probably only a home studio without the necessary experience and equipment. You should stay away from those...! A professional master needs time, experience and equipment to sound right. A mastering compressor or eq costs around $5000 each. There is no way that someone could provide a mix and master online free.