The Ace is a clean boost/buffer with the twist of having the Flattley Solaris Pro tone stack allowing it to be used as a clean boost (tone at middle), a treble boost (tone clockwise) or bass boost (tone anti-clockwise) and all stops in between. It can be used at the front end of a signal chain to push distortion pedals harder and also pre emphasise the frequencies to be distorted. Placed in mid signal chain, it can help pedals that are a bit dull and quiet, such as vintage pedals by locally boosting gain and tone which in turn brings them to life. Put last in the signal chain, the pedal can increase the volume of a chain of pedals, enhancing the tone by increasing the presence of a lead tone by lifting the whole sound whilst soloing. At the mid tone setting, the pedal does give a slight lift in tone that will make most single coil guitar owners smile, push it really hard with another pedal and it will give a soft clip in a pleasant way. It will also help a passive bass guitar sound beefier, give great late night jazz tones on humbucker guitars with the tone fully anticlockwise, nice funky single coil sounds with the tone setting just past middle.