Of course you can check the OP-1, there are a lot to chose from the COMbutton menu. Power up while holding the COM button… or you just begin playing on your new device!
Your OP-1 willbe shipped with a more recent firmware, higher than 14203 if you bought it from TE’s shop.
Slump is a synth engine from the Beta 76 OS, if installed you can choose this synth by pressing the BIG 1-button under the screen, not from the normal menu (1-8 buttons)
Most people here love their OP-1 and take it to bed with them ; )