The Amptweaker Swirlpool Jr. is a mini version of the company’s popular (and fairly large) SwirlPool. It uses the same all-analog circuitry, which is reminiscent of the synchronized Tremolo and Vibrato circuits common in some vintage amplifiers from the ’60s, but it can slightly shift the LFOs to create a variety of swirly effects.
If you press and hold the footswitch you can access a 2nd speed, which allows you to ramp up and down between the two speeds like a Leslie cabinet.
A volume control allows you to make up for any loss of weight in the signal due to the effect.
Amptweaker’s owner and pedal designer James Brown came to our Stompbox Booth at NAMM 2019 to shoot this video.