API Tranzformer LZ report (YMMV!)):
Excellent quality construction, feels very sturdy, pots have a nice resistance. A+
Even with everything flat and no compression the sound is very full sounding,
punchy with a small silky flavor (difficult to describe). The review in Bass Player (June2017, available on
API website) describes very well what I heard.
EQ works well for general tone adjustment (broad EQ)
XLR is really line level (very hot). I dont' like this because I would need
to have a backup regular DI to use the 1/4 output in case the mixer (or soundman !)
have problem with the very hot level.
Compressor gets grabby pretty quick, but works well to add punch and presence at lower level (1-2 depending
of Input). However, I found it difficult to set, because it's interactive with the Input Gain. The gain control increases "character" and volume, but also increases compression.
So you have to work between the the Gain, Comp and Leve controls to find your sound.
I am not afraid of knobs (I have a FEA DB-CL!), but I didn't like this aspect of the pedal.
When everything set to taste (gain, comp, eq) it sounded awesome. With my Acoustic Image Clarus SL, it was like having an API bass amp. And with Audiokinesis TC112, well, it was nice
It's a nice product, but I didn't keep it for these reasons :
I found it difficult to adjust to different basses because of the interactive nature of Comp and Gain controls.
XLR was not mic level
Size, not pedalboard friendly
I did not tried it live, but I dont think it would do a difference enough compared my trusty JDI and a comp pedal of my choice (flexibility !).