Tangerine Dream style ratcheting sequence sent via midi to these five synths. System 55 modular also added around 3 minutes in. These synths have never had a problem with tuning (give model D 10 minutes) and sound great, some of the Wasp knobs are a bit flimsy so OK for home studios but live gigs would require a fairly cheap backup. I know people dislike the Behringer clones but for me on a low income they help me experience the legendary sounds I like at a price I can afford. I am retired on a UK state pension.