a compressor might not be the rite one in this situation.
compressor mainly to balance dynamics, use too much of it, it will add even more hiss and really kill off the dynamic of your playing. You signal will sound too even, without any peak nor drop, to symbolise mood changes in the geetar sound that accompany the music.
metalzone, by itself, its lacking in mids. Worst still if you are using a small amp. No matter how you tweak, the bee buzzing, fuzzy sound is hard to get rid off.
To make it clearer, you can try an eq pedal, to boost the mids. It will make it beefier and thicker sounding and clearer sounding. Another important thing on getting a clearer sound, use less gain, much lesser, choose the right notes as well. Some notes, when played clean, sounds ok, but when you let it go thru gain pedal, the clashing of the notes pitch will really sounds ugly and often make it messy sounding
lastly, to cut down on noise/hiss, look for noise supressor instead. Its the quickest way to help. bear in mind that noise supressor doesnt get rid of the noise in the setup. What it does, is just "masking" it temporary. Once you off the pedal, all your noise will be present.
To really cut down on noise, its a combination of grounding/shielding, cables, pedal settings etc. The noise supressor will do the job in the fastest way, but not solving the inherent noise/hiss in the setup.