One careful owner. The HATS909 is Roland's TR-909 analog Closed and Open Hi-Hats sound generatoradapted for modular synthesizer use. The front panel contains all of the controls foundon the original TR-909 drum machine, allowing you full control over the sound s volumelevels to mix with other drums and accent levels. In addition to those original controls wehave also added new controls, further enhancing this legendary sound generator.