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Let's go down to the Waterfall and check it out:
JAM is known for their NOS components and obsession for analog circuits, so naturally the Waterfall Chorus utilizes Panasonic Bucket Brigade chips to achieve it's rich sound. So why should you care? The Bucket Brigade chip was invented in the late 60's and was the first entirely electronic device that produced discrete time delay of electronic signals. This meant that the modulation effects of the day like delay, chorus, echo, and flange all born and maintained by clunky magnetic tape machines could be transitioned into portable and reliable devices. In fact a few years after the chip was invented it was licensed by none other than Roland/Boss and emerged in the CE-1; a BBD Chorus pedal that started off Boss's renowned history of stomp box production.
The Bucket Brigade chip works in a chorus pedal by storing your signal in a series of capacitors and transistors that fire off sequentially based on an external clock. If this makes you think of a line of firefighters passing buckets of water down a line, that's where they got the name. The short delay in the split signal is mixed in with the original to produce a variety of slightly out of pitch harmonies (rather than an echo) and a Low Frequency Oscillator is added to create the rhythmic "swirling" sound. The Waterfall Chorus has a fairly simple layout but with the vibrato and "deep" switches the sounds can get downright crazy. Here's how it works.
Depth - This controls how many altered layers of your signal are in the overall mix. At low levels it's a dreamy, shimmery unison, and kicked up it turns your tone into a churning choral wave.
Speed - This controls the speed of the oscillation. It ranges from a no-nonsense "doubler" effect to a vicious rotary style sweep.
Toggle Switches -
" --- Deep Switch" : This switch doesn't have an official name or description but it essentially cranks the depth of the entire unit up a notch. It's most likely adding some type of delay, and the effect is that the chorus and vibrato settings become more entrancing and watery.
Vibrato mode: This enables the vibrato mode on the Waterfall. It's reminiscent of an old Magnatone or early Fender vibrato, but with more clarity and richness. At moderate levels, it replicates the feel of a vintage pitch vibrato effect. But combined with the deep switch and more extreme settings it gets seriously spacey and complex. Don't forget your Dramamine.
At UpFront Guitars we've experienced a number of pedals that changed our preconceptions, and the Waterfall Chorus certainly falls in that category. The old way is not always nirvana, and sometimes "old stuff is just old stuff." But when it comes to vintage BBD technology, there is a difference. If you're already a chorus junkie looking for the "magic" pedal, or someone who needs to spice up an old rig, the Waterfall Chorus will provide.