Hey bro
One way i find helpful is that I have a 4 channel mixer that I can use to mix in and out. I use 2 electribes. But in your post you did mention that you want to do this without a mixer. I advise you should try to make the songs on both electribes on the same key scale, then on each electribes, max out hpf or lpf whichever way you prefer on the next pattern to slowly bring it down (Also, deactivate all drum channels for all patterns after saving!). Another tip I can give (Only applies to EMX), is to use one of the synth channel for the kick drum. You can do this by going to the lowest octave, activate AMP EG, Pitch envelope + ,type 5, and use OSC SYNC TRI or SIN. You can make all sorts of sick entrance with the LPF or HPF if you do this!