The Lehle Parallel SW II provides a variety of useful circuits for mixing two signals to a common output. The mixer/looper is equipped with an effect loop that can be switched in parallel and is wonderfully suitable for looping external mono or stereo effects into your own signal chain. Its mix control offers a stepless fading of the original signal with the wet signal of the effect loop. Accordingly, the Parallel SW II can also be ideally used as a parallel effects loop when connected via the 4-wire method. Thanks to the discrete Class A JFET input stages and its immense dynamic range of 122 dB, even studio effects with low impedance levels pose no problem for the Parallel SW II. Of course, the compact mixer/looper is composed of high-quality components in the proven Lehle manner and features the proven True Bypass Relay circuit with active switching click suppression.
This is the new product that will supersede the Parallel L. It provides stereo channels and a better dynamic range / lower noise floor.
I use it as a serial to parallel loop box for a serial loop on a Marshall 100w amp head.
I also have a number of the Parallel L.
I found that the Send control on the Parallel SW II needs to be turned fully clockwise to provide anything like enough signal to drive my rackmount guitar effects unit.
The Parallel also suffered from this issue but not as much as the Parallel SW II.
The Parallel SW II may be better suited to floor-based effects units that don't require as much signal as a rack effect unit.
Apart from this issue it's very good, well made and the sound quality is excellent, although at it's current price you would expect that.