Originally Posted by: turbohardtop 
Hi my system components are as follow:
mic: PGX24's with SM58
compressor: DBX 266 XL
Mixer: mackie ProFX12
Speakers: JBL PRX12's.
Source: Home theather PC.
For some reason I could not get enough echo in my system. The vocal sounds flat and is not sound mixed into the music at all. The mixer has built-in FX but it does not seem to have noticeable difference between pre-sets. Do you think i need a seprate sound processor to add echo?
Thanks in advance.
First of all, I'm not trying to be a smart a$$, just trying to point out what you should take a look at:
1) Is this the mixer you are talking about?
http://www.mackie.com/pr...series/pdf/ProFX-OM.pdf
2) I think you should select "Internal Effect #16" as described in the following picture

3) Double check your settings for #50 and #51 As shown below

4) For complecated mixer you have to play with different settings and adjustments, it'll take time to come up with what you consider acceptable mix. And you also need people with audio knowledge (not a novice listener) to help you out while adjusting your mixer.
Good luck bro