Bought this to use to trim down the output level of a Seventh Circle Audio A12 mic preamp, whose output is very hot (up to 30 dB) and provides not integrated output level control. The ATTY works well for trimming the output down so I can push more signal through the A12 to get a bit more saturation. Read more
However, two shortcomings of ATTY design: 1) only one level control affecting both channels of attenuation. 2) input/output jacks are on opposite ends with the level control in the middle so you can't easily fit it into a rack with level control facing forward. For the fairly high price of this unit, these two issues should be fixed.