MachineDrum eats TR-909. My friend's TR-909 is in Elektron's studio in Sweden, 'cause he made a deal to trade it straight across for a MD. Sweeeeet trade. Elektron truly have their shit together with that machine. They took everything we learned from making any drum machine ever, and put all those features in. Mute groups, for christ's sake. MUTE GROUPS!

Awfully fun interface too.