ROM expansion turns Roland TR-707 into an 808, LinnDrum and more

It gives you eight sound banks of iconic drum machine sounds.

For those old school enough to still work with a Roland TR-707 or 727, have we got news for you. HKA Design has announced a ROM expansion that lets you add on the sounds of the iconic TR-808, TR-909, LinnDrum, Linn LM-1 and Oberheim DMX.

The expansion gives you a total of eight sound banks, including the stock sounds of both the TR-707 and TR-727. Switching between banks is performed by holding down one of the first 8 step keys while turning the machine on.

Aside from the new sounds, HKA Design said that the modified TR-707 or 727 should behave just like a stock unit – with no loss in function. As such, it should also be compatible with other modifications or circuit bends you may have previously added. Check out the mod in action below.

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The kit does require a fair amount of soldering, but comes with instructions on how to install the expansion without wrecking your precious vintage unit. The full kit consists of a pre assembled PCB, a ribbon cable and a DIP socket.

HKA Design also shared a detailed write-up on his process of porting the sounds from the TR-808, TR-909 LinnDrum, LM-1 and DMX over to the 707 and 727. You can read here.

The expansion kit is available at $60 through hkadesign.org

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