Re: how to make sounds go well together when making electro/progressive House?
Definitely play around with EQ for mixing purposes, When you listen to a sound solo'd out it might sound fuggin' epic; but then due to the harmonics involved it can sound total shit in the context of a mix. So make sure when using EQ in a mixing situation you're attenuating absolutely everything you don't need to make the sound work for the song.
Also, play around making your synth sounds all stem form the same source via parameter adjustments/resampling. Might help