Audio Mastering contract of 32 minutes of Music

Enimanu is looking for a audio mastering artist to master about 32 minutes of music divided into 20 tracks of music.
Most of the music is acoustic, but some tracks feature synth. The task is to dramatically increase audio quality, and to lightly equalize volumes.

The samples are provided in .wav 16bit 44.1khz stereo samples and should be rendered in .wav 16bit 48khz stereo format. If the quality of your work in outstanding, future tasks shall be assigned to you on contract basis

Please write how much you would bid for the contract in PHP