A tab of acid in guitar pedal form, the Rainbow Machine can act as a delayed arpeggiator, polyphonic harmoniser, pitch shifter and just about all conceivable brain bending nonsense in between. The real kicker is the ‘magic’ setting and its interplay with the tracking control, throwing up an at times overwhelming cacophony of oscillation, discordance and warping. More conventionally, in can produce a beautiful, warm psychedelic sound, and a lush slapback echo. Word to the wise: if you do hit upon a sound you love, make rigorous notes on the settings; with 6 knobs and 2 switches, all of which have such extreme effects, the temptation to tinker can lead you to lose a sound that you can’t seem to get back. RRP $275.