Yes, you can use parametric equalizer for your bass and guitar tracks. You need one track for bass and another track for guitars. Then apply parametric equalizer to each one of them (using Adobe Audition 1.5 effects parametric equalizer).

You can use these settings for bass parametric EQ: http://www.audiorecording.me/tips-in-mixing-bass-guitar-like-a-pro.html

And for the guitars: http://www.audiorecording.me/tips-in-mixing-electric-guitars-using-double-tracking-technique.html

For drums, the crucial part is the kick where it conflicts with either the bass and guitar. So refer to this guide for mixing kick drums: http://www.audiorecording.me/kick-drum-eq-settings-and-compression.html

For snare also: http://www.audiorecording.me/how-to-mix-snare-drums.html

For second inquiry: Do I need to do mastering even though i had all the tracks trimmed, equalized, compressed, before mixing all the guitars/bass/drums down to one track??

Answer: Yes,but please do not compress the mixdown in an attempt to make it loud. This will ruin your mix which makes it difficult for mastering engineers to master your track.Please read this guide carefully as it relates to your inquiry: http://www.audiorecording.me/how-to-prepare-and-submit-the-mix-to-audio-cd-mastering-studio.html

Your mixing objective is NOT to make all tracks sound as loud as possible, but to increase clarity, balance and tone/EQ of the mix. After mixdown, give it some headroom for mastering engineers to do the work.

Thanks for dropping by.

you can reply at my email and thanks so much for this wonderful tips.

.Ranie