DLS Effects’ TR1 Tremolo uses two analog optical devices and a Warmth pot to dial in tremolo sounds ranging from tube to more aggressive, or any blend. Its Shape pot adjusts the tremolo wave shape and duty cycle, while the speed of the tremolo can be controlled with the Rate pot or tap-tempo with an external expression pedal.  The pedal’s independent in/out channels can be used in mono or stereo, including a ping-pong mode that pans from amp to amp. Channel-A in/out utilizes true-bypass switching, while Channel-B in/out has a buffered output. The unit measures 4.3” wide and 4.7” deep. See more at dlseffects.com.