Haha, sorry about that. I think your preview sounds a lot better than my version and the code is impressive. I need to make a few changes to my app, one of the main ones is the fact that you cant adjust the cutoff whilst the envelope is in progress but I have recently come across this technique which I am going to implement: http://stackoverflow.com/questions/30019666/web-audio-synthe...

My Acid Machine app has been built in a way so that all of the instruments are self contained modules, you could possibly create an instrument that would be compatible with the whole UI and step sequencer etc of my app quite easily.