It’s pretty close to sticking Buchla inside your PC: Softube are adding a Buchla 259e Twisted Waveform Generator to their virtual Eurorack, “Modular.”

This is in fact the first officially licensed software rendition of a Buchla module, though the official part may be the source of some controversy. Buchla Electronic Musical Instruments wound up in court with its original founder, Don Buchla, before his death. The parties settled out of court, but certainly some of the shine of the brand was lost in the process.

That said, branding aside, this looks like it might be the most complete software rendition of a modern hardware Buchla module yet. And it’s got a price to match – US$99, so oddly just one module model costs you the same range as a lot of full-blown software modules. (US$79 intro price through end of October.)

What you get is one of the more interesting modules around, though – digital waveshaping and deep modulation. I’ll let them describe:

The 259e consists of two separate oscillators—Principal and Modulation—where Modulation can be used either to modulate the Principal oscillator or as a separate generator of audible notes. Furthermore, the sine wave generated by the Principal oscillator is simultaneously applied to two of the eight available waveshape tables. A morph voltage pans between the two tables and a warp voltage varies the amplitude of the sinusoidal (driving) waveform. Both these functions can be modulated by the Modulation oscillator. Three of the waveshape tables are actually not tables in the classical sense—they are simply portions of the 259e operating program, full of unpredictable noise and frequent silences. This is the innovative Mem Skew mode, possibly the most unique feature of the Buchla 259e. When these tables are selected, the FM controls are re-assigned to table scanning functions and the FM inputs become table modulators.

In short, while the Buchla 259e can certainly be used for more traditional sounds, it excels at creating otherworldly twisted digital sonic landscapes. Which is why it is one of the most coveted synth modules on the market.

Why is this man smiling? Softube tapped Buchla engineer Todd Barton to work on this recreation.

Video intro:


  • Looks pretty awesome…

  • wingo shackleford

    “Use digital aliasing as a deliberate effect.” Well, we all knew that day would come.

  • Freeks

    Was i only one who tought that the price was 259€ 🙂