You did this with beepbox? But it's like drawing with mittens! It's all the more remarkable. I can imagine that you don't have the same mixing tools as on a DAW. Well, you have my utmost respect for making your music sound good with this tool!
Thanks! Actually I use an mod of beepbox called jummbox which adds a lot of features for EQ, including applying filters. It is quite complete but I've yet to delve deep in a real DAW to make it more professional, maybe for the next jam I'll give it a shot.