A cool little box! So primitive and cute! The 606 was the percussion side-kick to the TB-303. It even looks like the 303. It stores up to 32 patterns and 8 songs. The 606 allows switching between Pattern Play and Write mode while running - making the 606 the only drumcomputer in the X0X series that can be edited while performing and switching patterns. It is also possible to link up to 4 consecutive patterns in Pattern Play mode. There is only a mono audio output, however there are mods from Kenton Electronics and Analog Solutions that will add individual outputs for each drum tone.