Everytime i make a synth, and put out a melody, it still sounds so weak, even with a sub bass underneath. I normally get my sound, and then split into two tracks. Track 1 bandpassed, with the sound coming through between 120hz - 600hz and then ill put some reverb on it and a spreader. Then track 2, hi passed 600Hz onwards, with a small boost around 4000-8000khz depending on the sound, and then ill put some reverb on that, a spreader and some distortion. The reason i do this, is so i dont distort the lower end of my synth, so i split it into two tracks instead and distort the top end. But even after doing all this, it still sounds weak. Its a bit like the track thats hipassed is alot more dominant, ive tried so many things but it still sounds weak. Whats the best thing to do, when using these kind of techniques?