In this tutorial, we learn how to create a progressive house synth in Reason 4.0. Start with the mixer and add use the combinator. Right click, then create a polysonic synthesizer. Bring it down to four and then click the "show programmer" button. Select one, two, and three and then make sure your octave is four. Bring up the octave on the second so it's five. For the third oscilator, make it analog and make it a sign wave. This octave will go down one so you get some bass. Go to the mixer and move the balance to 92. This will give you more sound. Play your song after this and edit it if needed after you sample it.