I love the sound of the first tune its almost like the acid sounds that are in fl sytrus or that other sound. You definately have the build up but I was expecting the song to get much harder after all of the build up. A fat drum piece would help it out. Also it seems like you have reverb and delay on all the other synths but at the end the last synth had no effects which made it kinda stand out a bit. It's up to you on how you wanna approach that but if I like to make a sound almost with no effects I still put a stereo effect on. Also watch out for certain synths. They might be able to play that certain note you want but sometimes it might not be able to play it well. All and all I enjoyed it. Great flash music.