￥With the 259e, the answer is – pretty twisted. A coveted dual oscillator module now available for Softube Modular, Buchla 259e Twisted Waveform Generator is the first-ever officially licensed plug-in version of a Buchla product. While the unit can be used for traditional synth patches, its unusual inner workings makes Buchla 259e excel at metallic, cold, harsh, digital and screeching sounds.